There are so many factors that go into this.
Firstly how you actually experience your birth is so important. I had a wonderful birth and felt very empowered which set me and ds up for a great start. My mum nearly died in labour with me and was left with severe ptsd and lifelong mental health challenges as a result of that.
I didn't have ppd but I have had ppa. I also work in mental health and have excellent coping strategies and know how to manage it because of that which makes me more resilient. Not every mum knows ppa is even a thing and ppd is a black hole that can be extremely difficult to get yourself out of.
Every baby is different. My ds would have slept any time any place until 6 months. My friends little one had to be in his bed in silence from about 3 months making it much harder for her to get out and socialise.
My ds had colic and screamed from 7-11 every single night without fail for the first 4.5months. I have a really hands on dh and we just swapped every hour or whenever it got too much for the other. Dealing with that alone every night would have been much much harder.
I'm lucky enough to be on mat leave from a supportive employer. I had some savings to tide me over and we've been able to save while I've been on a reduced wage. Many mums are now reliant on food banks etc.
I was very lucky in that my bf journey has (while definitely not without its challenges) been a really positive experience for me and ds. My friend was triple feeding and pumped for months after a very difficult start for baby and it really affected her mental health.
Every single experience is different and while I don't think it's about 'scaring' new mums I do think that there is a lack of awareness of the bits that can be hard, so when you're the only one you know going through it- that's a very lonely place to be. And lonely is not what new mums need.
I also think in a wider context there needs to be greater social awareness especially in the employment sector that pregnancy and maternity leave are big deals. Sure some of us really love it. But others really struggle and that's normal. We need to be honest about that so we can do away with the toxic idea that mat leave is a 'holiday' instead of recovery time. That everyone is ready to leave their baby to return to work. That mums should snap back and be able to get out and about. That they should be back and fully rearing to go when they return from mat leave even if maybe they're realistically still in physio, still struggling mentally, still not feeling ready to leave baby, still struggling getting out the door with multiple kids, still feeling misplaced guilt that they really like being back, still struggling to work out how to afford petrol AND formula so they can get to work. Until we recognise the reality and the wide spectrum that post partum is then we're actually doing women a disservice and furthering those toxic norms.
It's wonderful you have had a great experience and have felt confident and capable, but don't think that your experience is THE experience.