I don't think I'll be *actively* going for it. The way I saw it, it was a lifestyle choice.

I'll still need lots o' iron for armorsmithery and blacksmithery since it looks like it's in lots of recipes.
Not too interested in goldsmithing, but in my quest for mythril, the silver is going to come my way.
And cobalt to follow.

If I do see the grade 5 mining achievement for a region, I probably would consider dropping a grade in that region. But do not think I would forcefully start with lower grades just yet.