Perhaps consider that ability scores, unlike their real world counterparts, are not necessarily representative of inherent ability. After all, over the course of an campaign, characters will become stronger, more intelligent, more charismatic, more dexterous, etc.

What does it mean to suggest that a characters intelligence increases? Mechanically, it means that bonuses to all intelligence based rolls will increase, just as increased proficiency increases.

As such, having a bonus to strength as a farmer isn't classist in a socio-political sense, it just represents that individuals with that rugged history will be better able to push their shoulder into a door to knock it open than their sage counterparts, but said sages, after changing careers to one of physical fury would and could over the course of their adventures become stronger (and thereby better at knocking down doors).

Likewise, what does it mean to have a higher charisma score as a consequence of being a noble? It's not out of reason to think that nobles may have had particular training in social graces and influence that is universal to all charisma skills while a farmer did not have those experiences.

While I do prefer Tasha's simply for the flexibility and will allow my players to take that approach, I do not come to the conclusion that characters creation is classist in the philosophical sense.

Considering that I start all games at level 3 and have done so for years, the problem of not knowing where your power comes from is moot. And I'm glad that multiclassing into these front loaded skills is effectively nerfed.