From a design philosophy, crafting seems like it is intended to be something you dedicate yourself too. If you want to just make a little gil on the side, mining/bot are more for you. You can sink hundreds of hours into crafting and still have something to do.

I'm really excited about the offhands (assuming the sealant is untradable) because you are time gated from acquiring them all. What it may mean is that you have to pick an choose what crafting class you want to be 4* capable. Saying something like "I'm a Armorer" will mean something other than "I haven't leveled/melded my other jobs up to par".