Those are all taken into account in the cab designs on Eminence's site:
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Since it's an LF driver the ratings are appropriate for bass guitar applications. A driver's power rating is open to interpretation, but the rating of a driver in a specific cab for a specific purpose is not subject to interpretation. There are several cabs illustrated, the only one rated higher than 450W is 13.5 cu ft, way bigger than the others and way bigger than the F115.
The fEARful page indicates a 3015LF in a small vented cab can handle 794W. That's simply not true, and note that it is only suggested and not actually claimed. The avoidance of listing anything concrete seems quite deliberate. Seems to me like they want you to think it can handle more than it can. Not saying that's what they're doing, just how I see it.
And sure, I'd give any fEARless cab a fair day in court, but based on what I'm reading, they're not trying to achieve what I want in a cab, so it'd just end up propping up my 4x10. If I want pounding subs I can have a proper subwoofer dropped off for me anytime. Half the time I have to turn up because the PA subs are too hot on stage. Not interested in adding to that, especially since the phasing would be brutal.