Theoretically, that is a viable strategy RIGHT NOW if everyone follows it.
(Problem is, it’s boring to do nothing for 45 minutes, so fights happen. And not everyone has access to a premade to withstand the boredom.)
You see, unlike whatever “premades” you may be apart of, PUGs on their own are “incapable” of developing ANY sort of strategy outside of just “zerging mindlessly,” right? (Isn’t that what you said?)
You really need to think about how the “common folk” operate, not just rely on whatever experiences you perceived, since they weren’t what “real” people do.
You said it yourself 