This is ok if they feel like casters to that person.
as long as it is just that... not "they ARE casters" or "It MUST be mind control"
again I don't often (and I don't think here ever) see 4e fans police opinions or dislikes...
In many cases, I agree. They call it a power source
someone posted back in the 20teens "Martial power sources makes it feel like a giant green battery in the middle of the multiverse" and I actually used a slight reskin of that as a joke for years in my games... "Willpower, Drive, Training, and a spark that sets you apart... you are worthy of the martial power source"
and it certainly feels like they gave "powers" to every class. This is a perception issue.
again, 5e gives powers too... action surge, cunning action, flurry of blows, rage, cantrips, channeled divinity, Second wind, skill mastery, Inspiration (bardic not general)... but if you like it you look past it.
as a comic book fan I often see people complain about 1 story doing something (most recently resurrection) and complain it breaks the world and takes them out of the story... when I point out cases going back 50 years of the same, they say it's different, the difference is if you like it.
It is why I feel like all the classes are the same with just a reflavor of powers and role.
I can understand why you feel that way... I don't though