If anything, we should get the blocksize to the largest rationally supportable size
This is exactly where reasonable people differ.
That is a key word right there "reasonable". I certainly haven't had any great epiphany as to how to choose the correct size or how to make it a reliably updated thing. Predictability and anything that removes human consensus making from an ongoing process is what I would favor.
The only way to remove human consensus from the ongoing process is to leave it exactly the way it is. No changes to the consensus rules ever (MP argument).
That is btw pretty much Wladimir's view. He's not going to back any change that doesn't have human consensus. So you either have human consensus or, removing it from the process, no changes at all.