The issue has been that so far in this thread, those similarities have been being used to attempt to club people over the head in the attempt to disprove their feelings.
It points out why... you feel.
Sure, but I think that's why most people admit that one of the weaknesses of 4e was how it presented and organized everything. People are fine digging through a giant spell list, but they aren't as fine with going through a level by level catalog for a class list of powers. I get why 4e did it, and I can see the strengths of that approach, but I can also see how that turned people off. 4e could have organized powers by source, and said, here is the list of tactics for the Martial power source, and just given the power list for each class.
It doesn't. It only points out similarities. Some of those will be reasons for why I feel how I do. Others will not. Similarity is not the deciding factor. It's a nebulous thing and attempting to find out exactly why is going be an exercise in futility.
The person who picks protection fighting style is a few levels layer almost definitely going to based on feel want the sentinel feat... but klang klang klang they work very poorly together.... I rewrote protection so that it would be more competitive with sentinel but I think there is a better rewrite so the one leads into the other.
Based upon statements that Mearls and Crawford have made about sub-systems, frex Inspiration, not every subsystem was designed with as equal care and attention in regards to its interaction with the base game as others. I suspect that Feats also likely fall into this category. I don't think that most people care too much because WotC delivered an absolutely solid base game with 5e.
but the feat is gained and presented well after you opt for the style. And the subclass is too.
