Yep, concur with this - having children and a family gave me a sense of fulfillment and purpose that has never really diminished. Won’t say every day is amazing or life is any less difficult. However, there is definitely something to be said for living your life for others instead of your own enjoyment.
"Even with this realization, there were lots of times where I sat on the couch the first year and just felt like I was drowning and life was over. That happened in the second year as well, but less after the child was 18 months. And by ~2.5, it's a lot better!"
That's hardly a good outcome for anyone, let alone someone who misses the joy of life they had in their 20s.