lua scripts would be for more advanced functions. You will still be able to do all the basic 'set type all metl' kind of things with a simple set_prop("type","all","metl") or something. Just a different syntax. And probably be able to use the old commands too, it won't go away completely.
Oh then feel free to. Though we should then have a help page with basic things we can do with LUA (I mean, TPT isn't as advanced as Roblox, isn't 3D, so it won't be that hard to use it)