First off, I don't consider a BB as an email client. It is much more than that, as it also provides calendar, contacts, phone, and Internet access.
As for what makes it better, IMHO it is the security that is "built in". But it isn't for everyone. The things you are ranting about are available to the corporate user on BES. The personal consumer version, BIS, does not include those features - yet anyway.
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