This behavior is not new to WoD. People did the same for the initial gear lockouts for CT and ST as well. As long as RNG exists, the mentality of "see if I get it and leave" will exist. Not much anyone can really do about that. They could increase the lockout timer for dropping a group, but that's a piss-poor solution to an issue that isn't all that big of a deal.

I have a theory of SE possibly making it so that each chest has two gear drops instead of just one to slightly lessen some of the RNG strain, but I know better than to think that would ever happen.