We all know...

HotCakeX 

Ok, thanks for the lecture LOL.  I have been beta testing OSs for MS since Vista. Dual boots, VMs, partitioned drives, their own drives; not, always, a vm.  You do state a good & valid point.  But, it's ok since whatever limitations there may be w/ a vm, oodles of Insiders have theirs on a physical machine and also, countless others using HyperV.  BUT, not a production machine!  Won't debate it, but that is never recommended & always discouraged.  Betas should be VMs, dual boots or spare boxes.  For those who do otherwise... thank all the gods & goddesses the IBs are usually, basically, ok.

There is a rumour that virtualization is often for testing purposes.  Speaking of which, there's another Bug Bash coming up, anon.  It (virt) is, also, nice since one can 'see'/ work in both the host & the vm simultaneously or easily back n forth.  

I will say, we have heard of fewer disasters from people doing that w/ Win10 than, when they did it w/ prior OSs betas.  Certainly, in the early Win10 days there were many forum entries saying, "I put it on my computer, what now?", to which, we'd say, "Sorry" & send a sympathy card 😉 Why it happens when the DL site clearly says, "Don't" 🤷🏻‍♂️.  I have IT colleagues who have said, w/ a wink & a chuckle, "Hey, it keeps me in business".

Cheers,
Drew