I am 1/72 for almost everything I build now. With the exception of one 1/288 ship model and some left over 1/700 ship kits from back when I had a dedicated ship collection going.
I had many scales at one time, lots of box scale kits, 1/35 tanks, you name it,,,,,,,,but, part of my "getting older, time to reduce the stash" efforts included selling off everything in scales other than 1/72 and subjects other than USN/USMC (it worked !!!, I am down to 550 models in my stash, lol)
I want to finish my 12" shelves with ground effects, so that the trucks and yellow gear can be displayed mixed in around the aircraft,,,,,,,so a constant scale is sort of a given with me.
Don't get me wrong, though,,,,,,,I grew up with an Uncle that built "anything and everything", and I could stand and look at his shelves full of Lindberg and Renwall models for hours,,,,,,,,,and did just that. It would seem just as cool today as it did back then.
Rex