Yes, subcraft skills should not be in local leves. If I'm doing a blacksmith leve, I don't want to be told I need a certain level of armoursmithing or leatherworking to do the synth. That defeats the purpose of doing a local leve for a specific class, as often these subcrafts are something I don't particularly want to rank up.

However, when it comes to grinding and crafting outside of leves, here's what I would love to see. Items which have subcrafts should give SP for BOTH crafts. Not an equal amount, but the subcraft could give a percentage of the SP in relation to the difference between the required craft ranks. It doesn't make sense that if you need multiple skills to complete an item, you're really only getting the benefits from one class.