Hi,
I've switched to Colemak a while ago and I love it. Most people know that the reason for QWERTY is not ergonomics. I've read a couple of things why QWERTY is the way it is, the most commonly quoted one being that QWERTY places the most common bigrams far apart to stop typwriters from jamming. This sounds like a reasonable explanation, until you actually check for the most frequent English bigrams. TH is the most frequent one, but the letters are fairly close. The fourth and sixth most frequent ones are ER and RE, respectively. ES and ED are also rather common.
If the claim that QWERTY arranges the keys to minimize jamming is true, why aren't these freqent bigrams further apart?
Cheers,
Workoft