Slow speed was never an issue for any of my old android phones. I would have happily continued using my previous phone if the manufacturer bothered to provide security updates. I bought the FP4 at release and expect to use it for at least another 3 years. In my mind that justifies the initial asking price, at the time other android phones with longterm support did not exist.

I have one and have never been in a situation where it's too slow. O must say though that they should have shipped with a decent camera driver to begin with. To me the story reads like this: smartphone manufacturer releases important fix x years too late.