I had never heard of the 'font override' option and was using Stylus in Firefox. That option together with minimum font size are a game changer for me. You've made my day, thanks!
I have a Sonos Play:1 speaker from 2013 still working perfectly with no plans from Sonos to change that. My Nest thermostat from same year will lose app and home/away features which I would say is over 50% of its current functionality, for a device that I bought for 250€. I wonder what Tony Fadell thinks about this.