>>52288140I think Tera is just fine. Its basically hidden power but for a whole mon. You dont know exactly what itll become, but given the time to develop, a metagame will show clear users and theyre typical types. Already the most common, and most sensical, types for RMoon are Flying and Steel, both for obvious reasons. Flying for acrobatics nukery, and steel because its that good a fucking type.
Really, the only problem comes from people expecting gen 9 to be like gen 8, where its stall up the ass and everything is so fucking predictable, instead of the educated guesses we have now.
Really, thats what pokemon is based on, educated guesses. Based on team composition, you can tell not only the general archetype it is going for (Balance, Hyper Offense, Stall, etc) but also what each mon's set will likely be, and this holds true for Tera types as well. You even pointed it out with Fairvalugg, and unless someone is going anti-meta as fuck, which happens in all metas lets be clear, there'll be clear better types for pokemon to tera into.
It aint broken, just underexplored.