Moving the thing about isn't half the problem
Just that with top loading dishwashers it is a royal pain if you keep things on top. That is use space for what manufacturers sold the thing upon, extra counter space. Not a bit of it.
You can put things on top of these machines, but then it all has to come off to load or unload. Then you have to put everything back on top again. This would go on after breakfast, lunch, dinner, etc.....
It isn't surprising you see many homes had a cubby built for these TL dishwashers. That solves some issues, but you still would have to roll it in and out to load one or more times per day until ready to run the thing.
Am that over my GE Mobile Maid for this reason among others. That and it has ruined all my everyday glassware and dishes. White dishes that survived years of hand washing, then more still with Frigidaire (badged Kenmore) 18" dw have promptly been reduced to gray marked mess. Glasses are hopelessly etched.
Just got a new set of everyday white Royal Doulton (first one that makes a quip gets it, *LOL*), and am not willing to risk it to the MM, so have been hand washing. So it does seem as if the MM's days are numbered.
Back on topic......
Top loading dishwashers made sense in early incarnations of the art; that is built in units right next to sink. You rinsed and then put things right into machine, no bending or stooping.