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.
Some people believe the earth is flat, I don’t think whether the definition is scientific or not matters much lmao