Recently I started getting messages from Clause Code (on a plan). "You're restoring an old session are you sure you don't want to compress the context? This will use a substantial amount of your usage quota"

So it seems they do care.

That's exactly what I said. They do care when FLOPs are involved. Restoring an old session with 900k tokens will require a lot of FLOPs to reprocess the 900k token.

Meanwhile, they don't really care if you use hundreds of millions of cached input tokens, which doesn't consume any FLOP.