Okay, there is a progression between classes that have more skills and classes that have less. It looks roughly like this.
1) Rogues have the most.
2) Bards and Rangers are in the middle.
3) Most of everyone else gets the least skills.
The problem is that these new subclasses are catapulting a category 3 class into category 1 without any lore/narrative/fluff justification for the departure. If there was a "Dungeoneer" fighter subclass that got 2 extra skills that would be fine. The one extra skill (with Expertise) of the Purple Dragon Knight is also fine.
I don't know, I think if people don't see the problem, they aren't looking at it from the perspective of class identity.
No, there isn’t a problem because class identity being tied to skills hasn’t been a thing for two editions now, and likely never will be again. The classes that do differentiate themselves on the basis of skills tend to do so with things like expertise, which is niche protection enough. Gaming as a whole has progressed such that attempting to make the rogue a more-or-less necessity in clearing traps and locks isn’t going to happen.
Furthermore, you’ll have to make peace with the fact that either you give fighters more skills, or give them guaranteed political connections, status, or extraordinary ability to affect out of combat scenarios. As Proxxy says, fighters have routinely been bottom of the barrel in the class hierarchy, due in no small part to the fact that almost every other class can fight well AND affect the world more easily through skills or magic. I personally would like to see yet more done for fighters on the exploration/social side of things, personally.