I am a touch typist and laptop keyboards are fine. I haven’t tried keyboards with weird curvatures but most desktop keyboards are too wide if you don’t have big hands.
I can see the first point about repairability but it’s not really something you can’t do without and is the price to pay for mobility (which is something that could be considered essential). If you use a laptop with full peripherals, it can act as a desktop when there is no space but you can’t do the opposite :p