Olster,
I'm a 'millennial aviator' and I regularly hand fly up to to 10,000 (as required by company regs), or until the SID has me flying a boring straight line after some turns.
I don't do this to impress the likes of you...I spent years flying busted arse pistons in the bush, to upgrade to ancient turboprops, to finally getting a crack on a 25 year old jet, to moving to baby bus' and then finally the tractor here in the desert.
I fly up to 10,000 (just below it actually), not to impress wankers like you, but to remind myself that I used to be a pilot and to show myself, that given the situation....I could be a pilot again.
Eternity.
On a side note....it's not 10,000 every time.
Sometimes ATC last minute airborne changes, wx etc dictates that it's better to get to autopilot on sooner rather than later to focus more on airspace, wx or profile management.
But failing that, it's handflying for as long as is appropriate, and most certainly not to impress a tosser like Olster....