I'm pretty sure there were several others in that thread that also went 'OMG there's an xp bar there?!?' I didn't know there was an xp bar on the top of the toolbelt until sometime in mid A17 when Roland made a comment on the forums that referred to it. It's a pretty subtle tell, but once you know to look for it, it's very easy to see. Using a duplicate schematic, especially in a multiplayer game, where you're not just accidentally not being efficient, but you're accidentally avoiding a nice boost for your teammates really sucks, and a simple checkbox of 'known,' 'unknown,' or 'perked' would be super helpful. duplicate or unnecessary schematics are a prime candidate, but if I find a schematic I'm not sure if I know, i need to exit out and check through my crafting menu (which is also a bit unintuitive trying to figure out what you know and what you don't) before going back in and looting or learning it. Money seems harder to get in vast amounts, so I look for things I can sell when I can. I'd really love if you could quickly tell, by looking at a given schematic/recipe, if you 'don't know' it, 'already know it' or 'know it due to a perk.'

With the (frankly awesome) ability to pick up the ability to craft almost all of the different items from the various skills through found schematics, I've noticed that it's really easy to 'not know' if you need a given schematic or not.

7 days to die schematics