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People being used to the Docker commands is a very weak reason rkt isn't a valid candidate. Let's not forget the most important aspect of rkt, and that is that it follows the container spec standard.

> People are already used to the basic of Docker command.

The tiny amount of existing early adopters can be made to adopt something else one more time.

Not to mention that they constantly break the Docker api and interactions. Knowing the commands today is not helpful in the future. Once you get past "docker run <image>" so much has changed the last couple of years that it is pointless to hold that up as a virtue.

So the challenge, to me, is that if you fork docker, then people are going to have to get used to a different command structure anyway as the forks will diverge.

One of the reasons to avoid a fork is the confusion caused by two kind of similar but not quite the same implementations that diverge slowly over time.

rkt is unlikely to just copy the feature set of Docker, but they provide competition in implementing new ideas and as it's not intended to be identical there's less confusion.