I do it because I like it and find it fun. Games are about having fun.
I already have my character planned, have traits of his that are independent of ability scores. Even though I constantly dump Str, I never make characters in which frailty is part of how I RP them.
I wish they'd spend more of those years finely balancing the math into making so that DC's and saves scale at similar rates. I'll gladly give them a big FU, the same every other Homebrewer/GM gives I expect.
It's a bit baffling that so many think you walk in with 8 18's prewitten on your sheet. No! You roll the stats at the table with the GM.