Doesn’t R2 have wheels? Or am I going crazy?
I expect that the droids have wheels because the designers literally couldn’t think of another way for them to move around. But I think it’s telling that the wheels are either barely noticeable or covered by panels.
They could have hovered, like every other vehicle in Star Wars ¯_(ツ)_/¯
I meant as a practical solution that wouldn’t require excessive special effects for the budget and era.