I understand your argument as well, but for me I'm still in my 20's and am having fun renting airplanes for now. I would rather have more money for flying in 5-10 years when I would want to use the plane for family travel. I can pay off my house without too much difficulty before I'm 40 and then have the rest of my life (which I don't know how long it will be, I get your point) with a little extra cash flow.
I'm not saying there is a right way or a wrong way and I certainly think there is a balance. For now that balance puts me at renting a plane for about 40 hours a year, but paying off debts early in life (while also saving for retirement and kids college). That balance could have me buying a 150,172, m20 or straight tail bonanza and I could easily put 20% down, but I'm also aware of the elevated cost risk that owning an airplane entails. Right now I'm focusing on paying off the mortgage so I can buy the plane without feeling guilty. Again, a personal choice.