On 2, perhaps I misunderstood how docker works but don’t you need to deploy a docker image that is binary compatible with the type and version of the host OS? Then don’t you just move the problem? (Two customers with different types of OS require you to recreate the docker images). And what if these customers need to upgrade their version of linux, do they need to contact all their software vendors to reissue new docker images?

I never understood how creating the tight dependancy between the host and the docker image is not a problem.