IMHO, there are taxes and there are taxes.
Expertise was a Tax. As was X Defenses. They were there to plug holes in The Math(TM) because fixing the problems the proper way (giving +1 to hit at 5/15/25 and +1 defenses a 16/26) would have made WotC look WORSE for saying "Oops sorry, screwed up. Here's the Fix!"
UNLIKE, say, WoW (hey, a contrast of 4e & WoW coming up!) WotC can't retro-patch the hit-probabilities and Stealth-Errata the classes so that none (well few) are the wiser because a TTRPG has to have all the gears and tubes on the table.
Now, some of the other "taxes" I see are more "optional". Not having Melee Weapon Training isn't a deal-breaker, but it does seem stupid. (My rogue uses dex with all his dagger strikes EXCEPT when instinct takes over.

) Still, my sole time running a Dodger-rogue my palette at 10th level included MWT and WE; two of my feat choices filled to do what I think the rogue should be able to do anyway.
The last ones show the problem with WotC's math and ability scores. I imagine WotC assumed most PCs would have an even spread of scores (akin to the default array) so that a 16 or 18 was Ok, and you could have a 14 in a secondary, 12 in a tertiary and do just fine. That's not the case. Most people seem to think that you MUST have an 18 or 20 in your prime, a 14-16 to Secondary, and your other scores are minimal because your never going out of your Build. (For example its suicide to try to take battle-cleric powers with a lazer-cleric). So they began to patch so that your prime score does ALL the heavy lifting. Why? The Math(TM) which forces you to have such an uber-high score in order to hit-anything!
WotC could fix a lot of these problems by fixing the math and how it scales, but that would require 5e to do. So until then is Feat-Patches or Houserules.