asking the other way round: did you ever have a problem that you don't quite know how to replicate a given setup? for many tasks it saves you time - instead of

asking the other way round: did you ever have a problem that you don't quite know how to replicate a given setup? for many tasks it saves you time - instead of having to mess with the host environment one can instead create an isolated environment - and give the docker access to the host file system or network. It takes a time to get used to that mode of working (without automated testing it is very hard); but it does have a lot of advantages.