It is possible to move posts to the right category.
You are right though people will not chose the correct category, and it will be a little more moderation work.
But I don’t think it should be too much, and it hopefully would be beneficial enough to be worth it.
i’m not sure if additional categories giving enough benefits. Only a few months ago Strip down amount of categories? was done because people where often overwhelmed by the huge amount of categories.
Maybe instead new tags for e.g. “docker” or “appliance” could be chosen instead?