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It's not just gh-ost. pt-osc is much safer to use when you don't have to worry about updating foreign keys.

Here are some of Github's reasons for not using them: https://github.com/github/gh-ost/issues/331

I think this is pretty normal for heavy MySQL users, honestly. When I was at Eventbrite we didn't use them for the same reasons.

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I've read about their reasons, I just didn't want to open a discussion about it :D

Deciding to implement constraints on the application/business layer is something that github can probably do, in the same vein that Facebook can create their own PHP compiler.

I just think that you can't use these examples as effective arguments on whether someone should use FKs or not. I guess whatever brute-force solutions these companies would apply, on any given problem, would probably work one way or the other.

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