I think it's mostly the lack of DOF preview on the K1000 that bothers me, something I'd always miss and do when I shoot with mine.
Actually, the K1000 does have an unofficial DOF preview that you wouldn't want to use for every shot but can be pressed into service on the odd occasion.
Simply press the lens release lock and rotate the lens a few degrees and long before it falls out of the bayonet mount the spring loaded aperture assembly will close the diaphragm to the selected aperture. Perhaps not something to try for the first time when leaning over the Grand Canyon, but get a feel for it over your sofa!
Steve




