I dont know about 'hating' on roe bags, but fishermen that choose loose roe over sacs or vice versa usually cite some sort of advantage with it. ie it looks more natural, it milks better, you get better hooksets, etc
I also prefer sacs mostly for the convenience, and having spent lots of time fishing alongside loose roe users, I cant say one is clearly more effective than the other. They both work. More fish are caught on loose roe because more people use loose roe.
All these perceived advantages are probably not that significant as far as the fish are concerned and this thread clearly shows that lots of people have plenty of success with sacs and it's certainly not preventing people from catching fish.
It doesn't have to be pretty, I can tell you that my roe bags look so good but don't understand why it is that my buddy hooks a lot when his bags look like a tiny pouch full of crushed sugary singles.
I like this observation because it shows how something that might look 'good' to you or me may not matter much if at all to the fish. Pin-nook's friends success despite not having nice round perfectly tied sacs probably suggests that particular aspect may not be that important or is insignificant relative to other things like scent/colour/drift.