What keyboard are you talking about? The standard QWERTY keyboard is the only keyboard I have ever used. If you receive formal training on QWERTY, you need never consider an alternative.
It's not about having the most frequently used letters on the same row but within easy reach from the home position of asdf jkl;
I took two years of typing in high school. It was the only worthwhile class I ever had in those years. The class had about a 20:1 ratio of girls to boys because it was seen as something that secretaries did so the boys mostly missed out. But career-wise, it was the one skill that got me on a fast-track. When I got into management, most of my fellow managers had to rely on the secretarial pool for everything. Being able to write my own business letters, respond to correspondence much quicker, etc., gave me a huge advantage.
Many common letter combinations require awkward finger motions.
Many common letter combinations require a finger to jump over the home row.
Many common letter combinations are typed with one hand. (e.g. was, were)
Most typing is done with the left hand, which for most people is not the dominant hand.
About 16% of typing is done on the lower row, 52% on the top row and only 32% on the home row.
Dvorak studied letter frequencies and the physiology of the hand and created a new pattern to alleviate the above problems, based on the following principles:[7]
Letters should be typed by alternating between hands (which makes typing more rhythmic, increases speed, reduces error, and reduces fatigue). On a Dvorak keyboard, vowels are all on the left home row, as well as the most used symbol characters, while the most used consonants are on the right.
For maximum speed and efficiency, the most common letters and bigrams should be typed on the home row where the fingers rest, and under the strongest fingers (Thus, about 70% of keyboard strokes on the Dvorak Simplified Keyboard are done on the home row and only 22% and 8% on the top and bottom rows respectively).
The least common letters should be on the bottom row which is the hardest row to reach.
The right hand should do more of the typing because most people are right-handed.
Makes sense to me.
As I understand it, the standard keyboard was actually designed to slow typist down to avoid key jams in the old mechanical typewriters.