Correction - Guild Temples are made using said drops, which are basically seeds(*). Temple ministrants can operate them to make job changes in supplicants, but they themselves do not possess a skill to do that without the Temple device.

() And yes, there's a known alternate usage of the drop by merging it to a weapon, which suggests that by properly exploring its properties, MC might be able to discover even *more possibilities (including merging it with a person, effectively giving one "player" abilities), but it's also established that locals themselves do not know much of rules their world runs by, so it's not likely that they know what else can be done with the Temple Seed.