Agreed. While I don't expect them to keep doing 2 jobs per expansion as I vaguely recall mentions of doing 1 in the future, 40 plates would future proof a whole lot more in that case.
I already have a single glam for all crafters, one for gatherers, and one for all my casters. Even though I wish I would be able to do individual, unique ones for each. Even crafters have class-exclusive glams that are so beautiful and cool, but don't get any use in practice for lack of space.