I have considered that a number of times, and I would definitely like to see those metrics. But I have decided not to. Partly because I respect people’s privacy, and partly because collecting data is an activity that is heavily governed by laws and regulations, and I don’t have the legal expertise to navigate that quicksand safely. I could hide the metrics behind an opt-in, but opt-in metrics are mostly useless because of selection bias.
I occasionally tweak the defaults based on feedback, but turning on any of the advanced settings by default is not an option. Those settings are hidden by default for a good reason, since they can be very harmful to the whole learning process. How much is debatable, and it’s not the same for everyone, but I want everyone who uses those features to have to enable them by themselves, and to have to see that warning.
Partly this is to protect new users who don’t yet know how harmful they can be, and partly this is to cover my own ass; if someone gets into trouble by overusing FD’s advanced settings, then I can shrug and say “hey, you saw the warning and clicked yes anyway, it’s your own responsibility”.
The bar to clear is very low because I don’t feel it’s my responsibility to prevent people from making their own mistakes, but that type of setting is always going to stay hidden behind some kind of hurdle.