A lot of these don't make a lot of sense to me. How is freeing up my right hand to use the keyboard a reason to use my left hand? If I use my right hand then it frees up my left hand to use the keyboard instead.
Or mod+workspace# gets me to the window the screen I want is in, then mod+right tabs over to the application I need.
Totally agree with your view though. No real compelling reason to switch sides
Seems small, but as a righty i've been doing the left hand mouse/trackpad for a while now and it definitely helps on the rsi.
On the other hand (ha!) you lose access to navigational keys that are typically used when you're "mousing", changing between apps/tabs and screens - e.g. alt-tab, ESC, alt-w, alt-q, alt-F4, meta-shortcuts, etc.
I noticed that I use the right keys - enter, backspace, delete, etc - mostly when I'm typing, so I want my two hands in the keyboard anyway.
For me the mouse on the right side is the best combination.