There is a problem. There is no file mentioning subpixel under /etc/fonts/conf.d/ nor is there any line in /etc/fonts/fonts.conf, but I found the preset files in /etc/fonts/conf.avail/.
So it means that the UI is not adding those symlinks.
Do you suggest to just dump the contents of the BGR plugin straight into /etc/fonts/fonts.conf to see if it changes anything, or I break the system?