2. I once did an exchange semester of university in France, where i was forced to use their computers for programming. Not only did I start 2 weeks after the other students due to timing issues with my primary university, but then I also had some very stressful weeks learning to program on azerty keyboards. It was very painful at first and i nearly went back to two-finger typing, but in the end after 5 months i became more fluent than i expected on azerty.
3. 3 years ago (i was around 24 years old) I decided to switch from my layout i used until then (ISO, swiss french) to the Ansi Us layout, and I am happy i did the switch. It is so much better for programming, especially wrt to [] {} (). And I even prefer typing diacritics by using US international. I write fluently in french and german with this and I like it. The main pain point was switching from vertical to horizontal enter, I typed \ for months...