I think there might be a bit of an American side to the general thought behind it being a "hot take", because of how many awful zoos there are in the USA (whereas a European could probably visit hundreds of zoos without any of them being like American roadside zoos). Even the posts themselves were specifying AZA and non-AZA zoos. I know that if I was visiting the USA I wouldn't be going to all that many zoos - even some of the AZA zoos look pretty depressing. A third-world zoo in a first-world country is not enticing.
There are a few places in Europe too that are quite dubious, but still appear on some itineraries because of the rare species they keep. Tierpark Donnersberg in Germany is a zoo that fits very well within the roadside zoo category, which given to its location is fortunately rarely visited by zoochatters. But there are quite a few zoos that are preffered by European Zoochatters over similar-sized zoos with better animal husbandry solely because of their species list, such as Best Zoo (named after the town not the quality of the zoo).