In my opinion, squash merges are evil and enabled only out of necessity because people fill their PRs with spam commits and won't bother to fixup/squash themselves.

There are very good reasons not to enable squash merges. For example, code formatting changes should almost always be in a commit of their own and not squashed together with a refactor or new feature. If you bundle these changes together, git blame output becomes a mess and it's more difficult to distil what the actual changes were in a commit.

Crafting intelligent commits is a skill in itself that more engineers need to learn.