> I find the comments Copilot proposes is better than average comment quality for the code base I routinely work on

Maybe the average is just so bad? The completions I get for comments are document what the code is doing, which is not something that I ever put into comments. It's always:

a) A highlevel (prefixed to the function/block/scope definition) list of steps, input expectations and output expectations for the forthcoming function/block/scope

Or

b) A note explaining why the code does what it does.

A comment repeating the code but in English is useless.