Lyxen
Great Old One
See, that's interesting, because to my mind it lowers the power gap between a casual player and an optimizer.
Not necessarily. What I see is that an optimiser WILL use the new options to create a more powerful character by before by taking into account race power synergies that he did not use before because he felt constrained by the racial ASIs, whereas a casual will not necessarily use the racial ASIs to increase the main stat, since it was not, before, a main driver of his choice.
This only works if, by using Tasha's, you somehow force all casual to use their ASIs in an optimal choice. But it's not what I prefer, I prefer options that totally lets the casual choose what they want, and that prevents the optimisers from creating too much of a powergap. And looked at it in this light, Floating ASIs are a bad option.
Said another way, to prevent the power gap increase, you have to force casuals to use their floating ASIs in a way that prevents the increase, but I'd much rather have them still free to choose whatever they want.