Old keyboards aren't flat intentionally. It's because the profile of the keys is designed to make them easier to type on (so your fingers have to move less dist

Old keyboards aren't flat intentionally. It's because the profile of the keys is designed to make them easier to type on (so your fingers have to move less distance to reach all the keys). If flat was better, keyboards would have just been flat from the beginning. It would make manufacturing easier, after all.