Willie the Duck
Hero
As others have said, Dexterity being universally useful makes a tortle a niche-best option, but doesn't change that it is now a solid option for lots of builds.
Regardless, my overall take is that there were winners and losers amongst the player races before Tasha's, winners and losers amongst the player races after Tasha's, but there were changes in which ones hold what status. Despite what WotC says, that some races had attributes which didn't synergize well with each other (ex: Yuan-ti) or with the other racial abilities (Mountain Dwarves) was clearly part of the balancing mechanism.
It's also worth noting that the other options in Tasha's also changes how this plays out. I find that Fey- and Shadow Touched feats are so good* for known-spell classes like Bard/Ranger/Sorcerer/Warlock, that that often takes precedence over things like an easy 17 AC.
*simply because I am much less likely to find myself in a situation with plenty of spell slots, but no spells which would work in a given scenario.
*Or the socio-political implications thereof.
Regardless, my overall take is that there were winners and losers amongst the player races before Tasha's, winners and losers amongst the player races after Tasha's, but there were changes in which ones hold what status. Despite what WotC says, that some races had attributes which didn't synergize well with each other (ex: Yuan-ti) or with the other racial abilities (Mountain Dwarves) was clearly part of the balancing mechanism.
It's also worth noting that the other options in Tasha's also changes how this plays out. I find that Fey- and Shadow Touched feats are so good* for known-spell classes like Bard/Ranger/Sorcerer/Warlock, that that often takes precedence over things like an easy 17 AC.
*simply because I am much less likely to find myself in a situation with plenty of spell slots, but no spells which would work in a given scenario.
I think the Tasha sidebar is a well intentioned, poorly implemented idea. It's not particularly well thought out, it brings back some of the metagamey elements of 3.x era. It seems like a band aid put on a paper cut that someone thought was a gushing wound and it's kind of half on, half off, like when part of the sticky part gets stuck to itself but you're frustrated and use the danged thing anyway even though you know you really don't need it.
I think the Sidebar was a patch, and a reasonable one given the situation, but one that was clearly hamstrung by prior decisions. Whether the patch was necessary depends on how much one believes that not being able to play Race X and Class Y with a starting prime stat of 16 really was*, and I know reasonable people who disagree on the subject.TCoE was clearly aimed at levelling the playing field, so to speak, for classes and races and I think it did a pretty good job of it. It's a lot harder to weaken something once it's out in print. They could have gone further with some of the changes, but that risks making options too OP. As it is... there are people who say it's clearly power creep, there are people who say it didn't go far enough, but most of the people I have seen say that it's mostly a good patch to bring options that weren't as playable up to par. Anecdotal, of course, but I definitely haven't seen as much talk of power creep as when XGtE was released, or some of the reactions to older products...
*Or the socio-political implications thereof.