Earlier quoted context omitted.
While ergonomic keyboards are big part of some peoples fight against RSI, for many more using them is about comfort. After you get used to having tilted keyboard going back to normal one just feels tight and uncomfortable. Also for me big part about customizing your tools is exactly that - you get to customize your tools. I type professionally so it is insane to me when I see my colleagues working on some random lapt…
"Insane"? I type professionally too. On my laptop, in a myriad different settings. Sometimes in a coffee shop, sometimes on a quiet bench in a hallway, sometimes at home on my sofa, my kitchen table, and sometimes at my desk. I enjoy every minute of it and I'm having a blast. 11 years and counting. If it doesn't work for you then it doesn't mean it won't for anybody else. It's surely not "insane".
GP said "insane to me". I understood this as a colloquial expression of disbelief or surprise rather than an actual accusation of insanity.
E.g. I might say it's insane to me that anyone likes Brussels sprouts. The state of mind of someone who could hold such a position is so alien to me as to be comparable to insanity.