Ever since 2.0 we have been expecting a sort of FFIX moment with Ramuh. We expect him to shed light on the nature of the Primals and maybe on the Ascians.
However, he is a Primal. He sucks on the aether injuring the land (or slowing Twelvewoods' recovery) and he tempers the mind. This should not be tolerated.
You are confusing Ramuh with Kan-E-Senna or one of the Scions. They stated he was not an immediate threat, so there was no need to wage war on the Sylphs, while Gridania had to deal with the Ixali and Garlemald. The matter was merely postponed.