I did not have more time in my 20s. In my 20s and early 30s, I was busy “getting out there”. Building my life, my interests, my foundation (not just my career). Now I have a happy life to stand on, and can devote more time, attention, and energy to my family.
I don’t deny that your way can work out as well. But OPs advice was “get children before you are 30, don’t wait until after”. Whereas my honest advice, based on my experience, is “wait until you are 35, you’ll be much more stable life in several regards”.
Which approach is best for you depends on a lot of things. For me, I can honestly say, there is no way I would be where I am if I had had kids in my 20s or even early 30s, and I also wouldn’t have been as good a father as I am right now based on how I’ve grown since then. Both things that my child directly benefits from.