It's a good thing for Lua but not a good thing for the web and these things are partially mutually exclusive.

One of the reasons Lua's evolution is better than JS is because managing versions when you have to keep browser compatibility is way more difficult.

Hm. Good point.

Yeah, because it would have solidified Lua == 2.1. Instead of Lua == 5.1, 5.2, 5.3, or LuaJIT.

That would be a pity.