Earlier quoted context omitted.
Ubuntu 19 is terrible. I was forced to use KDE (Plasma) instead because they broke so many basic UI concepts (to give you a tiny taste: changing tabs went from Ctrl+Tab to Meta+Tab, the keyboard layout switcher takes 2 seconds or more because it pops up a stupid little window to show the language selected, and many other things just like this I thankfully erased from my mind and now only the frustration remains).
I use the keyboard layout switcher only with the keyboard which is pretty much instant, so I wonder how was it broken in any of the Ubuntu 19.x releases — that sounds worrying if it carries over to 20.04? (I am on 18.04) "Any Ubuntu 19.x" because non-LTS Ubuntu releases come out every six months, so there was Ubuntu 19.04 and Ubuntu 19.10, but never an "Ubuntu 19": they are never as polished or as stable as LTS relea…
People who switch between several languages just can't use Ubuntu because of this, read some testimonials on the bug linked above.
This is just one of the pain points though. There were many.