i use c++ blueprint function libraries, but i usually only put code in there that is impossible to do with blueprints, like functions for adjusting sound volume or multiplayer split screen, maybe i should use it to optimize blueprint function call overhead, like you suggest. my only problem with doing that, is that it makes it harder for me to help other people with their blueprint scripting. i like to be able to post a few event graph images, without needing to tell them to open visual studio. and so far, blueprint alone has been more than efficient enough for everything i have attempted.
also, if you want to explain TMaps to an artist, don’t just say “its just a map”, because artists call plenty of things maps: texture maps, gradient maps, world maps, ui mini-maps, and even game levels are called maps…
TMaps are more like the Math definition of Map, where a function translates inputs to outputs. artists generally don’t think of that definition when they hear the word “map”.