I've gotten into the habit of just trying what was suggested. Often it's in an area that was a bit neglected and can use a brush up anyway. If it doesn't end up well we can look at the commit and agree that the improvement isn't there, and discuss where to go. Revert or push further. Or maybe I misunderstood. And often I'm surprised that what looked like an equivalent alternative to me, turns out to be much nicer.

It requires broad agreement on the way the thing is to be built. Otherwise haggling over details is not useful.