That's a weird take, considering Fennec is FF on Android, just with some minor config changes.

Your statement is akin to saying: "Firefox on Debian is my solution to Mozilla abandoning FF on desktop"

If FF on Android _were_ abandoned, then so would Fennec.

I use Fennec, but because I know that it the well-supported, actively developed Firefox on Android, but available on F-Droid.

which sadly Mozilla doesn't provide or allow F-Droid maintainers to publish it as "Firefox"