"Wing it" doesn't really provide the kind of guidance that I'm looking for. In 3.5, things are clearly spelled out, and I'm far more comfortable figuring out what to do and how.Depends on what's being done, but answer is always "Wing it." Maybe grant Advantage/Disadvantage, maybe the enemies flee, entirely up to the DM. The Transmuter ability is laid out clearly. There is some information on crafting in Xanathar's Guide to Everything, but the rules are suggestions: rulings (by the DM), not rules (dictated by the designers). I assure you that it is quite simple in practice.
The transmuter ability is not laid out clearly. At all. A sentence or two is not clearly laying out how the ability works. For example, can the material be worked in its new state? Does it retain its worked shape when it reverts? This is the first thing my Wizard wanted to do with his new ability. The first. thing. The crafting rules in Xanathar's are the barest hint of guidance and doesn't really tell me how to run a session of crafting.
It may be simple, but that's my problem with it: it's so simple it doesn't actually provide me the guidance I need to decide how the system works. Anyway, this is way offtopic now, so I'm just going to agree to disagree.