I researched & found a Acer all-in-one computer for my mother a few years ago.
And it came with a Acer Low-Profile Keyboard (thin keyboard and thin flat keys).
(I have also tried the Apple keyboard before at the shop but the keys on that are too thin and it was bad)
After typing on it recently I was amazed how good typing was compared to a full+size (normal) keyboard. It was quieter, felt so light and much faster to type on.
I think the low-travel but bumpiness of the keys was great.
I currently have a old Logitech Full-size keyboard (well actually it broke recently after 7+ years but I had an identical spare), and typing feels slow compared to the Low-Profile one.
I think low-profile is the way to go if your keyboard breaks and you are looking for a new one (at least for the average person).
Just find a cheap one by Dell or Acer etc.
Anyone else try / own a low-profile keyboard?
I've tried (but don't own; a friend does) the Logitech MX Keys. Quite expensive at ~$200 but a pleasure to type on. I guess the price isn't too bad compared to what people will spend on mechanical keyboards (which I find bulky and noisy).