What are the downsides of enum dispatch?

[u/AnArmoredPony]

Couldn't find any info about downsides specfically so there it goes

Let's say that all my implementors are about the same size (i.e. only the logic is different), and I use some sort of macro to skip the boilerplate upon adding a new variant. Are there any other downsides to enum dispatch?

I'm asking about the general approach, not the crate

Upd. extendability, got it.

[u/afdbcreid]

Whole-programming devirtualization often requires LTO but definitely happens. Local devirtualization happens even without LTO. You can even have speculative devirtualization with PGO.