That's right, and I acknowledged that.
However, seeing the thread title and pointing out where and how the class could use improvement doesn't really seem that much offtopic to me, especially since the proposed solution basically seeks to fix the Sorcerer by turning it into a less inferior Wizard, which I don't believe would have been a good approach.
It's not so much that I'd be resistant toward the notion of a wider spell selection, but rather I don't believe it would have addressed much:
Wider spell selection, for the most part would have only given the sorcerer access to more DC spells, which they cannot really support with spell foci that they (as already pointed out) get very few of.
Even if they could support a wider array of spell schools with spell foci, it would have made only a minor difference and mostly in PvE, because
a) in PvP most DC spells are very unreliable and spell foci rarely make any difference once we take into account average saves
b) in PvE all DC spells represent very inefficient use of resources unless infinicaster
Spell foci are nowdays taken mostly for their perks and not so much to increase spell DCs - for the Sorcerer this usually means ESF:evocation(1) for access to Hellball and GRuin and either transmutation for better ZOO buffs or conju/necro (all of which are just different avenues to improve summons)
Sorcerer gets sufficient spell selection up to lvl 5 spell circle, lvl 6 spell circle is critical, lvl 7 spell circle generally offers a very poor selection of spells (as the OP pointed out) and lvl 8 and lvl 9 then usually exist for metamagiced IGMS (very little reason to go beyond the listed essentials). Once we take all that into account, we might notice that the entire spell selection issue currently boils down to lvl 6 spells (and even that has more implications for Sorcerer's PvE performance than PvP)
(1) i.e. ESF taken for the sole benefit of removing the blowback damage from epic spells - something that could have been supplanted by, say Loremaster, had that been viable