Wow, you just won't stop with the condescension. You won't even accept that it is difficult.

> I am just saying that I never had any problems migrating to Swift 5.

Good for you. Guess what, people have different code and different experiences.

> you found so overwhelming

I didn't say it was "overwhelming". I said that it's more trouble than it's worth for a free hobby project. It's not even a real problem yet, because as I already said, "The project now compiles". The problem will occur "when Swift 4 support is removed from Xcode", which hasn't happened yet. Even when that does happen, I can keep around an older copy of Xcode for quite some time.

The reason I brought this up in the first place is that unlike with Swift, I can still compile very old Objective-C code, and sometimes I need to. Objective-C generally doesn't break stuff (with the notable exception of Objective-C Garbage Collection). I'd rather not deal with the hassle of tool breakage if I don't need to.