EDIT: yes, I was supposed to put this to 4.4.0.72 thread. I will leave this here for my self-humiliation 
Thanks you developers for the update! After month of everyday usage (on xperia 10 III) I’m been very satisfied. Biggest improvement for me has been the solution for Office365 and Oauth - I mean, I wish I could go without it but unfortunately I have to live with the choices of other parties.
I’ve been pretty satisfied with the web browsers current state as well, I used to prefer Mobile Firefox (android), but I haven’t really used it at all recently. There’s still few UI quirks like difficulty to open links to a new tab and copying text from a webpage; I think the long press is quite sensitive to finger movement, so the long press won’t register if there’s a slight (but mostly expected) slip or budge.