I've had the same GT Richter steel hard tail for better than 20 years/ It's all I need or want.
A "better bike" isn't going to make me a better rider, or give me "all day endurance". I know my limits.
I'm only capable of having "so much" fun ;-)
A note to add, My youngest son, working this summer at a bike shop, waiting for snow to fly at Kirkwood, just built his "dream bike" Selling off his $6K full suspension "Zoot skoot"( I don't know what he built last time, but it was "full featured") , and built a hard tail. Long travel up front he described.
He compared numbers on sprung and unsprung weight, and found out it was really his fat butt that was the big difference.
Oh, He is NOT FAT. In fact his diet worries are eating enough.