It’s worked out well for me. My son who bought his own first house is now 32 and moving to a larger one. It’s worked out for him.
I was able to take $175K in equity from the sale of one to pay off another. So no mortgage, and no other debt.
If you do it right, it works fine. Btw, not all mortgages are 30 years. I did 15, but sold after 7.