I see the appeal of the "Active" variants, but not only were the previous 2 exclusive to one carrier in the USA but they were not sold at all elsewhere. That made their possible market very small compared to the mainstream S6 or S7, so it's not so surprising that few people have them and hence few feel qualified to answer questions about them.
The S8 Active is supposedly no longer going to be a carrier exclusive in the States, but it's not clear whether it will ever be sold outside. If it were then a more durable model without the curved screen and with a larger battery would have an appeal, but I'd be worried that as a minority model Samsung would forget about it for software updates. My guess is that it will never be sold in Europe though, so the question probably doesn't arise for me (an import with no warranty support has little appeal).