Improvement: Server-side blocks?

[lighth7015]

Perhaps it would be interesting to be able for the server to handle the way blocks look/act so you wouldn't need client-side mods outside of UI tweaks.

[OvermindDL1]

Wouldn't be at all hard to have a backend block type that maps to wasm for server scripting or so, displays on the client as another block (or armor stand for custom rendering).