This has been already discussed on twitter and elsewhere, but I really like the idea to format Bitcoin denominated prices with separator on thousands of sats. For example
Fee: 0.00'000'003 BTC (= 3 sats)
Pay: 0.00'100 BTC (= 50 USD)
It makes it much easier to understand and parse quickly. For small amounts I think it's probably still better to use sats, but when the price is closer to Bitcoin, then this works well.