I thought I had read it. We are here dissing or discussing the fact the clients would float the limit, aren't we?

If the limit can float, who controls the things it takes into account in determining whether to float and how much to float? What is it looking at to make the decision, that is not controlled by miners?

There is still the question of what the default behavior should be. Here is a proposal:

Ignore blocks that take your node longer than N seconds to verify.

I'd propose that N be:  60 seconds if you are catching up with the blockchain.  5 seconds if you are all caught-up.  But allow miners/merchants/users to easily change those defaults.