Ancalagon
Dusty Dragon
Counting the number of class features of extra proficiencies is the wrong way to look at things. You have to measure a subclass by how good it is at the things it wants to do. So yes, when you have a subclass that's intended to be highly transformative and make the class fill a role that doesn't come naturally, there's going to have to be a lot of bonus basic abilities to get them up to a reasonable threshold. This doesn't make them stronger because the entire point is that they don't synergize with many of the existing class abilities.
This is especially true for gish type subclasses. Because there's no baseline gish class in 5e, all the gish subclasses have to either tack spellcasting onto a martial class or dump a bunch of martial weapon and armor proficiency talents onto a caster class. If you're just abstractly counting the number of class features these subclasses offer you'll get a high number, but that's deceptive. Those class features are a rework, not an upgrade, and they exist only to enable a new style of play for the class. Once you see them in actual play it's obvious they're no stronger, or at least not stronger because of those extra basic proficiency elements.
This is very true. A gish may seem like she can "do almost as much as a wizard" but often she can't, because 2/3 of her magic is devoted to enhance her fighting ability. A gish that uses most of their magic for utility/blasting is a 2nd rate caster and a 2nd rate fighter at most.