[BAILOPAN]

You will NOT NEED TO RECOMPILE many old AMX plugins.

However, anything that uses VexD will not be able to find the new natives, and will need a recompile.

One thing ENGINE does is changes the VexD calls to be more readable.
Entvars_Get_Int => entity_get_int
ENT_SetOrigin => entity_set_origin
et cetera. Although there is a VexD_Utilities.inc file to be backwards compatible, the binaries won't have the new natives.

However, all authors will need to do is post plugin source and the autocompiler will take care of that.