This has got to be a version of the Stormwind fallacy, or some other named fallacy, by claiming that fluff can make up for broken (in this case, underpowered) mechanics. Also, a list of all the 7th, 8th, and 9th level spells with utility uses from the SRD only:Fluff, fluff, and delicious fluff. No 9th level spell has domestic uses, aside from Wish. Meteor Swarm has absolutely no use in a non-adventuring environment, which is where the Domestic Sorcerer stays. Nor do I usually want to use Wail of the Banshee to do the dishes, or after a night out drinking with my chums.
Every 7th level conjuration. Teleport Object, Phase Door, Magnificent Mansion, Plane Shift (for getting rare materials from other planes), summon monster (manual labor), etc.
All 7th level divinations, as well.
Forcecage: Pricey, but great for exotic pets.
Greater Shadow Conjuration
Statue (become a tasteful decoration)
Reverse Gravity (For cleaning ceilings)
Mind Blank (a butler should never let his thoughts get in the way of the job.)
Planar Binding, Greater.
Summon Monster VIII
All divinations of 8th level
Otto's Irresistible Dance: PARTY!
All 8th level Transmutations
All 9th level conjurations
That's a lot of non combat utility that this class does not get.