There's nothing complex and impossible about removing some "if" statements responsible for code signature enforcement.
One of surface, it's a lot LOT more work than that, the very obvious is "it's probably not if, but assumptions made everywhere, so it's not remove a condition but add a lot of check and rethink the whole process to ensure it's still consistent and safe";
Two, that's not what the issue is. It doesn't matter if it takes a lot of work or not. Nobody would accept something like "unfortunately, it's impossible to do all the complex engineering to comply with the YourCarCannotHaveA50PercentChanceOfExplodingWhenStarted regulation", which is an exagerated exemple on purpose; whether it's hard or not has nothing to do with anything being discussed, it's only a PR cop out.