I think it'd be great to have a Remote Desktop System integrated into Opera.
I am using Google's Chrome Remote Desktop extension for Opera and it works great. Especially the interoperability between all kinds of OS's and devices is absolutely fantastic and makes it superior over Teamviewer. I think Opera could make a real difference in the web landscape by making Remote Access a central feature of a browser, and be on the for front of browser innovation once again. So far not many people know that Remote Desktop functionality exists or are hesitant to install third party software (maybe similar to VPN before you guys made it part of Opera). But whenever I show this tool to a less tech-interested person they love it and start thinking about how they could work on their office PC from their tablet at home or things like that.
I have no idea how elaborate it'd be to integrate such a feature, but this would make Opera the go-to browser if you want to span distances between your devices. Remote sessions could be linked to your Opera account (incentivising more users to get an Opera account), and you could easily switch between all machines associated with your Opera account with two clicks (maybe some icons on the sidebar or something).
Idk.. just an idea