I must thank you for your question, and must (embarrasing as it is) admit I was wrong.

I started a reply stating that one can no longer use <i> elements and must instead include svgs, but then I decided to double check - and found I was wrong all this time... Some minor details have changed, but mostly for the better. Their marketing is a bit annoying too, but that's the price of having a sustainable business model.

I obviously haven't checked version 5 in projects yes, but I guess I should now. So thanks for making me realise my mistake...