When you say "no longer counts" what does it do? A little dot to indicate that there is a notification is a standard Oreo feature, so if it's doing that that might be all you get. Otherwise it depends on the launcher, but I have a feeling, from other threads, that the stock Samsung launcher is just doing the notification dots (but would be happy to be corrected by someone who actually has got a Samsung running Oreo).
I never use the stock launcher on any device, and third party solutions work as they always have (i.e. I have unread counts on my icons, using Nova Launcher and TeslaUnread plugin, and I'm running 8.1)..