Whatever you can think of, you can do it was the advertisement.
It's kind of funny that they used that tag line when describing their game system in the early days... and it's countered by something as non-problematic as "I'd like to cast fly, at third level, in this supposedly D&D video game, in order to float 20 feet up in the air and avoid the melee warriors". It's not even thinking of something weird or unusual, it's just a tactical choice of core mechanics... and the game engine
literally cannot handle it.
