Given that GitHub is a large Ruby on Rails app, I’m surprised we haven’t seen Microsoft doing more to improve the performance of Ruby language given they are one of a small handful of companies that have deep language/compiler talent. (Don’t take this as me knocking Microsoft. The speed of development on GitHub, VS Code and even Microsoft 365 has been phenomenal.)
VS Code is really great for the amount of features it has. GitHub is okay-ish. But Office 365? Teams is prob one of the worst apps I use nowadays. It consumes so much memory and cpu you would think it's actually mining crypto. Outlook is also a joke. Excel got better IMO. No strong opinions for other apps.
I do agree Teams is trying to be a jack of all trades master of none at the moment.