I am not saying that every single hoster will integrate LE nor that we should go with either of other two technically possible but barely feasible solutions.
Rather, my point is that LE aims for easy (part of which is free) and secure. I’ve already stated why we can’t both have ‘secure’ and ‘something which lets anyone do a not-so-secure thing because they supposedly know what they’re doing’.
So, it may not be able to fit into all usecases. But should it? The target should be ‘security’, not just ‘plunge certificates everywhere and we’ll be fine’.