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CoreCLR does have the ability to compile the GC as a DLL and then choose different GCs are runtime by loading different DLLs. Search for FEATURE_STANDALONE_GC in the code base.

This feature is enabled in the official builds though.

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You meant "local GC" initiative?

Ain't that relatively young, not so mature and and designed with specific GC design in mind interface?

It is. A few key assumptions are based into the runtime, namely that the GC is a generational GC with contiguous regions and that the GC doesn't need a read barrier, among many other things. There's a bunch of assembly in the runtime that embeds some implementation details of the GC in a way that's hard to decouple. The API came about by untangling the GC and the rest of the runtime; it took a lot of work and the resulting API probably isn't what we'd choose if we were building a GC with it in mind from day 1, but the whole scheme of sideloading a GC works pretty well.

You may be interested in watching my talk about it at NDC - https://www.youtube.com/watch?v=zVbTmgbiZsA&t=23s

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