While testing in every possible situation does seem like a good way of beta testing, it does make more sense to do that sort of testing in the products final stages of testing.
(someone said that earlier in the thread but i cbf finding out who but whoever it was, good point!
)
As for using add-ons with beta products, if you actually care about testing the product thoroughly, and were a die hard fan of the product, you wouldn't use it with things which alter it in any way shape or form.
Otherwise if you wanna use stuff like Plus! with things such as WLM 9 and stuff like that then you shouldn't really be complaining to anyone about issues you find since your the one stupid enough to mix uncomplete and complete in the first place (that said if you also wanna waste time UNINSTALLING those add-ons to prove whether the problem will replicate itself which you may have NO IDEA how to get it doing so they hey - be our guest
)
EDIT: After reading Cookies post (pah he posted that while I was writing mine)
Weeeell he said he was sick of everybodys opinions, so in a way it looks like hes trying to establish the definitive reason WHY or WHAT beta testing is all about, however if that were true the thread title totally contradicts that - it states hes just expressing an opinion. However if that were true theres no reason to call everybody with wild and wacky opinions an asshole or anything.
/ 
