D&D 5E Things that make no sense rp wise

[The Crimson Binome]

That particular one is so easy to fix though - larger creatures have a higher max damage from falling, end of story.

That still doesn't solve the problem at hand, which is that larger creatures should suffer more damage from falls of a moderate height.

You could solve it by saying that damage scales faster with elevation for larger creatures. Maybe tiny creatures only take 1d6 per 40 feet, and huge creatures take 2d6 per 5 feet, and it all caps out at 200 feet rather than at 20d6.