I personally voted for the Minecraft mountains to be updated at Minecon 2019 because we could use for actual mountains in the game that aren't just hills meaning they should utilize the 255 available blocks. Additionally, floating objects should be reduced. Nevertheless, those mountains would look in a way bland as there'd still be a key factor missing erosion. Erosion would cause the mountains to have sharp tops and be overall much. more realistic as otherwise, they'd be lacking a lot of detail. On a side note perhaps you should make it so that mountain biomes can't spawn next to water-based biomes(aka oceans and swamps) as mountains next to oceans aren't that much of a natural occurrence.
Here's an example of an erosion map
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