Honestly, I don't see the big deal.
I don't like to make a stink and I let everyone put their tramp stamp on both my home and vehicles.
Sure I now have trouble looking through the window with all those stickers, but I love for people to know where I get my gas, wash my car, where I buy my tires. The parking garage sticker was a little big, but I didn't want to make a scene at the time.
My house looks weird because the phone company keeps changing names (AT&T, Illinois Bell, Ameritech, SBC, ....) Oddly enough, they insisted on a new sticker when they finally changed back to AT&T. AT&T and Comcast keeping coming back to put a larger sticker, but ComEd's and Nicor's stickers are still be biggest.
I could go on.
Honestly, the question of omitting dealership branding is a simple one, and if anyone makes a scene, it's the dealership.
That said, I have seen dealers do dealership branding right. A couple of dealers I know ask the customer if they want the dealership sticker and plate holder and in exchange, offer free/unlimited use of their basic car wash. That to me seems like win/win approach.