There's really nothing to debate. It's a matter of what one wants/needs. My sister and her boyfriend both have Pearls with no data plan. They have no want to use email or the browser. They never ask for workarounds. They like the feel and size of the device and just use it for phone and SMS. In that case, it is not necessary as you say.
On the other hand, my brother and I both have Curves and data plans. We rely on the data features such as email. To each their own. It's a matter of what the person needs.
Personally, I don't think I could use a BlackBerry without a data plan after having one. It would almost be like going from broadband back to dial-up. That's just me.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]