This is where I am. I'm open to the idea that Brady's loss of some physical ability can be compensated for by TB's skill position players. He has the keys to the nicest car he's had in a while. But I still wonder about this partnership, and Arians is fairly overrated as an offensive guru.
DLF has an article up right now about this. It's only available to subscribers, but most pertinent to this thread: in his 15 seasons as either an OC or a HC Arians's offenses have only produced a fantasy QB1 five times (his numbers for RBs are about as average and his numbers for WRs are a little more solid). He also strikes me as arrogant, and I wonder how much meeting in the middle with Brady there will be - or what that middle even looks like. I'm guessing Brady was reassured that he'd have input in the offense, and I assume he will. But I don't trust there will be enough negotiation to close the gap on the mismatch between Arians's approach and the system Brady has thrived in and/or his current physical limitations.