Once you reach LuaJIT levels of performance though it's not like you need more. If you're doing a huge amount of heavy lifting in your embedded runtime then you've probably designed the application wrong.
The fat better arguments are that it's more common and there are more libraries.
Yeah that is a good point, I also imagine lua is far easier (build/linking) to add into your application compared to pulling V8 or JavascriptCore.
So if you only need a small language to do a couple thousand lines of code in than it still might be a better choice. But for larger projects JS still seems better due to the ecosystem and knowledge available.
But if you compare some games like baldurs gate 2 where most of the event logic and quest state is in the scripting language, then maybe it is worth spending the time to add JS. But if it is like Civilization 6 where only small stuff like UI and I/O mapping is in the scripting language then it is a different matter.
Yes! It's clear the consensus is that he needs art direction to get consistency, but this is how you actually put that into action. He needs style guides 100%. It's also potentially a good longer term investment, you can re-use and adapt them.
The guide also needs to include lighting, which he has diddly-squat of.
The fat better arguments are that it's more common and there are more libraries.