Exactly. Yes, I've used them and it was horrible. For me, the difference is in do I get to compile this from sources myself or do I get someone elses compiler

Exactly. Yes, I've used them and it was horrible. For me, the difference is in do I get to compile this from sources myself or do I get someone elses compiler output? IOW it's not comparing vastly different vehicles, but rather a vehicle with its blueprint. Also, a long time ago it was commonly accepted that spaghetti code is awful. Docker replaces all that with spaghetti services and debugging gets much worse.