When they’re not damaged they work every time every launch.
What you’re talking about is the one day they stop working which is an abrupt giant change that extremely noticeable and once it’s broken it stays that way.
HFI on the other hand is hit or miss the entire time.
What does not happen is perfectly good sensors stuttering or sometimes not detecting or sometimes not be able to get you over a certain incline. When they work they work 100% of the time. And they keep working until water or salt or intense heat are introduced. If you can avoid these things your sensors will stay working and when they break nothing bad happens you just have to change some settings.
i do have to say when is was using hfi on my sk3s the start up was pretty good. i just used trampas video on turning hfi on and i used 120 motor amps and there was not a piece of terrain i couldn’t get over, BUT hfi does have it’s issues and i have switched back to my sensored motors because of them