I don't have kids, and most of my close friends don't have kids. All by choice.
I think a lot of people are more clued into the stress of having kids, despite social media's best attempts.
I don't feel like kids would add anything positive to my life and just be a lot of stress. My partner and I are self-employed, we can travel a lot at the cheapest times of year, get up when we like, plan our work when we like, go out at night when we like, see our friends at weekends. Have time for hobbies and learning new things. Volunteer in the community outside our bubble, helping people in need and improving the local environment and services for people. We have enough money to be comfortable and don't have conversations that revolve around poo or homework.
Best case scenario I'd shit myself, rip my genitals, and deal with endless screaming followed by stage after stage of different problems, 24/7 for at least 18 years, by something that drains my time and money. All while telling myself it was worth it because they look cute asleep. "This too shall pass" just seems to involve every stage, with people saying "it'll get better" when what they actually mean is a new set of problems. Then they'll either never leave home and you never get peace, or they leave home and barely speak to you again anyway after the first few years, leaving you thinking, what was the point of all that stress.
Every time I see friends that do have kids they seem incredibly stressed. It's hard to have a conversation because they're demanding attention or listening in. Many of them regret it, or their partner, or their life in general.
I feel like the most common reason people give for having kids is that they worry they'll be alone in old age, which is one of the most selfish reasons and also you aren't going to be able to force your kids to look after you (and why should they give up their lives anyway).
I'll be in sheltered accommodation with all my friends, playing bingo 😂