Keep in mind that my basis for comparison is a Galaxy S9. The Fairphone feels smoother and more responsive most of the time, but you do occasionally get freezes and lag spikes, mostly when you try to minimise an app that is currently loading something from my experience. Particularly heavy websites also slow it down sometimes, but pretty rarely.
And I wouldn’t really call the design “that bad”, I was listing off my issues with it, so it might have come across that way, but the majority of the time it works completely fine.
Yeah, I’d say 4 is about right. And the power button is a bit recessed (it doubles as the fingerprint reader), so it’s really hard to press it accidentally. I genuinely have no idea how it could randomly turn off in my pocket. As for the battery, I’m pretty confident it’s a software issue. It’s only happened twice in the 4 months I’ve owned the phone and a restart fixed it both times.