I think this is a good response, and I think a lot of the outrage over this issue is overblown. At the end of the day there's a fundamental tradeoff that Apple needs to make on behalf of their customers: performance or stability. They chose stability, and I think they have a convincing argument as to why: "It should go without saying that we think sudden, unexpected shutdowns are unacceptable. We don’t want any of ou…
For point 2, there is Coconut Battery on MacOS. This is telling me my old iPhone 6 has 90% capacity after 400 odd cycles, which is probably par for the course, but I have no idea if that's bad enough for the performance throttling to kick in or not. Hopefully the new screen is going to be detailed enough to say how much throttling has been applied.