The block size limit already keeps the nodes small enough to maintain decentralization. That's why this argument has no weight.
Discussion
‘Small enough’ and ‘Decentralized’ are not objetive parameters. A change that allows for more arbitrary data to be included in blocks that would not otherwise be there can only hurt the cost of running a node and decentralization.
I never stated the extent of the negative impact, just that there very clearly is one. So the question is, is it worth it?
There isn't an impact. That's the whole point you're missing.