No, we're not.
The OP isn't asking childfree people anything. She's asking parents how they think they would have felt, knowing what it is to raise children, if they would have remained happy if they hadn't.
@James637 Like many on this thread, I think if I hadn't been able to have children, I would have struggled, thinking I was missing out. As it happens, I have 3DC I love dearly, and they bring joys that inherently only come with children...but they can hinder joys that come without children.
It's impossible to say without knowing you. But for example, things like travel. I love it. Most people do. But travel before 3DC involved a simple "Can we both get the time off? Great, where shall we go? What's in our budget?" Whether that be a weekend away in Norfolk, or 2 weeks in The Caribbean. Travel now involves, "Who's at school that week? How much have the prices gone up for half term? Can DH get that specific week off?" Buying three more new sets of holiday things, for children who don't fit their last years stuff. Three more plane ticketss to buy. Three more people to pay for accommodation. Planning is like a military operation, just making sure 5 people have got everything they need, packed in time, in cases that we can actually carry because the two youngest can't carry theirs. Then there's the 2hrs getting to the airport, and the 3hrs hanging around before boarding with toddler DTwins, who are not down for that length of time hovering. So we need entertainment for them. And the flight. And the hanging around the other end. And the transfer. And snacks for all of that. And nappies. Then the accommodation needs to fit 5 people. And have things for the DC to do. A kids club for a couple of the days is great, but often expensive, especially with 3. For these exact reasons, we haven't gone abroad since DTwins have been born (covid babies as well) and I really miss travelling. This is the longest period in my life, since birth that I haven't had a holiday away. But to pay 3 times more, for an experience that will frankly be a fucking nightmare, isn't high on my to do list either. It was different with just DS, I took him all over the world, so this isn't a fair reflection on travelling with a child, because I did that with ease, but travelling with more than one, the costs and difficulties significanly increase with each young child.
But, and this is where it's down to the person in question. The fact that we won't go abroad until next year, without question, pisses me off. But in context to how much I love the DC, pales into insignificance. I could have a very fulfilling and happy life without DC, because I did before I had them. No doubts about that. But, of course, at that point, I was unaware how happy DC would make me. If I had never had them, I would be none the wiser and have carried on having a perfectly nice life. It's only now that I know both the happiness I felt pre-DC and post DC, that I can draw a direct comparison, and say, for me, I far prefer the happiness that comes with children, more than the happiness of having no restrictions that come with children. Only you can answer that for yourself OP. There are some people who have deeply regretted having children. There are some who can not imagine life not having them, even before they have them.
You'll almost certainly have more disposable income without DC, you'll have all your free time, for yourself. You work only to the schedule you have for yourself. I think there is a misconception that because someone only has themselves to consider, that it makes them inconsiderate. It literally just means they have the ease of only considering and freedom to change their own schedule, because they haven't actively added dependents too it.
To echo PP, it also makes a massive difference if you have people around you to give you support and a break when you need one. We have literally no childcare option for DTwins, other than nursery, which costs an arm and a leg. Only one set of GPs are involved, and they haven't ever had DTwins, not even for an afternoon. With single DS, he stayed over GPs from a young age and there was a lot more freedom for me. DTwins, are a handful, and GPs are now that little bit older and can't be running in two directions after them. So they just don't have them. I get 6 hours break, 4 times a week. Which sounds a lot, but really isn't when they are this little. I can literally do nothing when they are here, I'm just supervising them and cleaning up after them. Plus, the cost is insane, we're paying for the 4 sessions to save my sanity from The Gruffalo on loop, and to be able to get anything done around the house, and equally to enable DH to work from home those days without "Will you stop licking that ladybird!" being shrieked in the background of his work calls. Other than that, I have to start my day at 7pm when they've gone to sleep, and frankly by then I want to just eat my dinner and have some down time. It will improve massively when they hit 4, have matured more, have got fully out of napppies, and are in school. Again, I'm not selling it well, so to speak, but I wouldn't swap this for the world. Maybe that's an indication of how much real life happiness the DC bring, because on paper, it does undeniably sound shit - and yet the reality makes it all worth it.