I would say it's more of the pleasure of tweeking the engine
I'm a ( "if it's not broken, don't fix it" ) type

I have 2 MDS engines, NIB they are rough
Couldn't tune the needle and often dead sticks
Everything in the manual was bull****
Had to strip, re-machine some parts and more
So now they are not the manufactures spec but run really well

My Saitos run really sweet, so no reason to modify anything
Not even checked my valve clearances