I see what you are saying, but Polarized Armour is pretty specialized other than its elite effect (which does nothing for the AI) and Ordinance Expertise is already the generalist. My thinking about adding a personal ship skill for fighters was that it buffs fighters (like the fighter skills already present) without being quite so easily spammable. You wouldn't have to take the skill if you didn't pilot a ship with fighters, just like you don't take Ballistic Mastery if you don't pilot a ship with ballistics.
If you want to buff Industry's effects in combat in general rather than specifically buff fighters then I can sympathize with the thought, but it isn't very relevant to OP's topic unless you have a suggestion for how Industry would change to buff fighters.
Sure, but if you want a capstone in Industry, then that fighter skill is useless to you if your fleet does not have a carrier in it, and the status quo of lack of combat power remains for the player dissatisfied with Industry.
With Combat, there are alternatives depending on want the player wants. With Industry, Ordnance Expertise and Polarized Armor are it before capstones, and Hull Restoration itself is underwhelming as a capstone in terms of combat power (and its campaign power can be replicated by high enough income at endgame, possibly enabled by alpha cores).
AI does not need to worry about prereqs or capstones, you just take it for them. Player is the one who has to worry about tiers and prereqs with his 15 skill points, and player is the one who can easily get elite on any skill and vent spam with Polarized Armor kind of like in older releases.
But a fighter skill in another tree would be nice. Probably combat skills in general should transfer some bonus to do this, not just Point Defense.
P.S. One more thing. Industrial Planning does not need to be removed for a fighter buff. Replace the player-only production buff with whatever combat buff (so that the player has a reason to take IP instead of farming more alpha cores for that job). It was a reason why I suggested lower DP on ships (even if not as much as the other two skills that do this) because that might buff fighters too (by making carriers cheaper and maybe put an additional carrier's fighters in battle).
Of course, alpha cores can just not have IP (or really go rogue and steal your colony) and then player may want IP simply for the +1 to commodities only, although that would not be ideal (player gives up combat power for IP to be on par with commodity production.)