I think you're right in classifying them as frontend technologies. The question, however, is if your potential customers think so as well. You could try to lookup a high end media agency in te area and see what terms they use in their job listings.
If those fall under the category of front-end technologies, why do you suspect they are rarely ever discussed? Would you say it's entirely due to business reasons? Even if there is limited business appeal, I would hope more front-end developers are still interested in those technologies.
I bring this up because I struggle to find others who are able to discuss those technologies and of course there are few professional opportunities relating to them.