They’ve already announced they’re working on RCS support. Should be interesting to see how they adopt it considering the obstacles like adding encryption support, working through Google’s implementation, etc.
Updating to the browsers listed isn’t going to solve a problem like the one you describe. Extensions and plug ins are still a thing in modern browsers.
Your browser isn’t supported because the developer or product manager who put the website together doesn’t know what the fuck they are doing. What could possibly require some cutting edge feature on a language learning website?
If you’re using actual apps for things like Twitter, the data should be siloed. If you’re using a web browser, then things like ad tracking cookies would be accessible between sites/pages.
Wah. Wah. Wah.