First of all, I'm talking about game engines, not games. Both Unity and the earlier Unreal Engine (afaik) used GC-ed languages for scripting.
However, if you want to make a quality game, you can not afford long GC pauses. I know that lots of people make games with GC pauses in them anyway. It is a value judgement, for sure.
It's certainly possible to work around GC pauses, but that effectively means you are manually managing your memory manager (instead of the memory), which can be surprisingly difficult.
It's also possible that whatever you do is so "small" that GC pauses never affect you. Enjoy your free lunch then.
However, if you want to make a quality game, you can not afford long GC pauses. I know that lots of people make games with GC pauses in them anyway. It is a value judgement, for sure.
It's certainly possible to work around GC pauses, but that effectively means you are manually managing your memory manager (instead of the memory), which can be surprisingly difficult.
It's also possible that whatever you do is so "small" that GC pauses never affect you. Enjoy your free lunch then.