IIRC there was a note somewhere, perhaps in one of the linked articled in the OP or in some post that discouraged bug reporting here. Also, the developer has not posted at XDA in over a year but has been quite active at github,
As to popularity, during decades spent in various OS I've rarely if ever seen a suite of programs/apps which could so completely become a users entire UI experience while each component maintains it's own identity therefor allowing choice about which is used or even present. Rare. Nice.
Humorous note: It is actually by the color of the Simple Gallery app icon (set by "Thank you") on the home screen that I know at a glance which of several similar devices is in hand.