Please honest answers only.
How often do you use voice and data simultaneously when you're NOT connected WiFi network? Think about it. Because 99% of my day, everyday I'm at work or home or a friends house and all three have WiFi.
I am on Verizon with a Droid X and I very comfortably use data and talk at the same time anytime I need to. The only time I'm not near a WiFi network is when I am driving and when I am driving, I am not surfing the web, especially when on a call.
AND to top it off, if you are an Optimum or Time Warner customer, it's likely there is free wifi for your entire county.
I do not think the lack of this feature is a big deal with WiFi literally everywhere. Especially a feature that isn't really used that often to begin with. Look at the commercials Apple has produced. NONE of them are real life situations.
Sorry, but AT&T has nothing but this one teeny thing on Verizon. And this teeny thing doesn't matter to many people, again, because of WiFi.