I fail to understand how you seem to know so much about these phones, yet don't know that it's fairly common knowledge that a better keyboard exists, in fact that's its name. However I fail to understand why multi-touch is necessary on a keyboard? I can tap out a message just fine the way it is by releasing a key and pressing another key. Nothing different than typing on a physical one.
Aha, but if you've used the HTC Touch Pro keyboards, you'll never really venture to the Droid's keyboard. The fact is, a good onscreen keyboard like on the iPhone 3GS will do just fine. The Droid's physical keyboard is nothing to marvel at, and with HTC really pushing out an excellent on screen keyboard, it's obvious why on a Droid I first went to the onscreen keyboard. The physical keyboard should be the alternative.
Yes there are crappier phones with resistive screens like the HTC TP2 and Samsung Omnia and Nokia N97 where the touchscreen doesn't cut it, so a physical keyboard is necessary.
When you're typing FAST with your thumbs, there is a tendency to press the next key before you fully let go of the previous one. I know this because I've seen plenty of people move from iPhone to other resistive screens or even capacitive screens w/o multitouch. It's not something everyone notices, because it doesn't happen till you type at a certain speed.
Most of the time I don't type that fast on my iPod and iPhone, but in the past 6 months or so I noticed that if I type as fast as I can, there's a 90% chance or so the auto correction fixes all my typos and its a fully recognizable sentence. So I realized that when typing IMs, I usually just fire away. E-mails on the other hand I take it slow to make sure I'm not writing gibberish to my coworkers/bosses.
Basically, the whole multitouch on keyboard isn't that noticeable unless you've gone hardcore with your Apple iPod/iPhone and then you realize it. I first figured this out when the Samsung Omnia HD came out. A few people on HoFo complained that typing was tough, and people didn't understand why. Later they figured out it was the whole releasing then pressing the next key.
Shrug. I honestly attribute the ability to type fast on an onscreen keyboard due to the fact the iPhone has such wonderful autocorrection. The Touch Pro has never been that great for me. I think if you spend a lot of time with your iPhone to master it, you will realize why other onscreen keyboards pale in comparison, and I can see why people demand a physical keyboard. HTC's HD2 and Droid Eris really come close though with capacitive.