Groveler is unbalanced, as can be seen when you compare a Technomancer with it to a Technomancer without it. If your argument is “Technomancers suck”, then the solution shouldn’t be to force every Technomancer to take a 10 point Quality to not suck.
Technomancer without Groveler: Thread Puppeteer at Level 2, Paragon path Delphi, use one Service from a Level 5+ Sprite on "Enhance", Puppeteer is now Limit 6. Technomancer gets 0 hits on Fade Resistance, takes 2 stun with the option to burn a service from a Companion Sprite to use the Shield power to reduce to 1 Stun.
Technomancer with Groveler: Thread Puppeteer at Level 5, Paragon Path Delphi, tosses 12 Data chips, Puppeteer is the same Limit 6. Technomancer gets 0 hits on Fade Resistance, takes 2 Stun with the same option to reduce to 1 stun with the Companion Sprite / Shield power.
One way costs 10 Karma at Chargen, the other costs Sprite Services, exactly the same outcomes. Some folks will take Groveler because they don't want the Sprite bookeeping, others will happily check off the Services to save 10 Karma at chargen for something else. Seems balanced to me, but clearly YMMV.
And yes. "Technomancers Suck" is a completely valid reason to not take away their toys. Big Picture, a Technomancer couldn't unbalance the game if it wanted to.