alright, so I did research on another solution
apparently there's an extension (Google-only sadly) that can block H.264 encoding to use other available encoding formats
looks like youtube's been lying to me all this time because most of the videos (haven't ran into one that doesn't work yet, just being safe) I've been having issues with now work.
finally I can say good riddens, and it looks like I don't need to pester the authors anymore
@paulokdvc as for me, the new UI is the main reason I added opera_autoupdate executive file to the block-list of my firewall. I'd better stick with Opera 58 than dealing with the new annoying bright and sharp light theme or the blueish dark one. The side bar which disappears without a trace when I'd like to just leave it at the speed dial is the other reason.
@luca786toni Yes as I mentioned above I did that. Tried all the options.
For some inexplicable reason I checked again and the IP Address wasn't showing my home city. I guess you can't control where it takes you. It took me to Sweden so everything was in that currency even though I had my home country's currency as the default in Settings. We need a VPN in our own country sometimes. You'd think the speeds would be faster as well if the geographical distance was a lot less.