Well then why the loss of summons -very flexible-? why is unseeen servant such a complex spell? (it is pretty useful), Rope trick is versatile, why is it so out of bounds? (I have successfully run sorcerers with niche spells, you just had to remain focused, but it was very possible)
The problem with being non-blaster as it is, is that your two spells known can easily be covered by the wizard's four prepared spells, which is enough to cover more of your niche than you, and he also has extra spells that do what you just can't, and sometimes he doesn't even need to spend slots to cast those. So he can do more than you on your niche, cover it better and do more outside your niche on top of that. At most you can get some use out of friends by using subtle spell, unless your DM just decides that the target knows it was you anyway. Or if you can multi three levels of bard you could combine silence with subtle spell to shut down enemy casters and go crazy with knock -but again, too long to get there, and good luck on not being labeled a munchkin in the process-. Seriously even as a favored soul you are quite limited to quicken and twin, not much room for extended or subtle that are so cool, but nowhere near as good to fill your niche, in fact there are so little spells you can extend, it is a waste, far spell is also high on priority.
Really, I don't know how you people use a sorcerer who quickens, empowers and heightens while then casting subtly and twinning a buff as an example of how powerful they are, during most of low levels sorcerers have only two options, and three during the high levels. Sorcerers don't really know that much metamagic, and each use of it reduces how many spells you can cast on the day. Heck, the collective consciousness still thinks sorcerers can cast like crazy, when it is wizards that can cast 1st and 2nd level spells at will!
The system is weighted towards blaster sorcerers, there's too may hurdles to do anything else, you can't do utility as well as you could in 3e and the bar where you party starts wishing you had a wizard instead is quite low.