I get where you're coming from mate. We do tend to go overboard on new players who hit the ground running. It isn't just Richarlison this season either. We were creaming ourselves after Bernards first start away to Leicester, and some are already calling for him to be dropped. Gomes is getting the plaudits too and after a handful of games some are already comparing him to Everton greats like Harvey and Bracewell. Some are also saying Digne is better than Baines at his peak.
I may be wrong but I don't think I've seen you on those other threads asking people to hold back a bit on the praise.
The difference with Richarlison is that it isn't just our fans, or GOT posters, who are saying it. He's worked his way into the Brazilian squad and current and former players alike are heaping praise on him. He's also getting talked about a lot in the media. There's a lot of hype about him at the moment but it isn't just Everton fans doing it.