Having criticism of dev decisions is one thing, but to say the game is "officially in maintenance mode" is silly. Just because you don't like what content is added in patches doesn't mean it's not added. Do I feel like a 4 month update cycle is way to long? Yes, of course. Even if it's only "two weeks" longer than a patch cycle in ShB, it still feels unbearably long. But it still gets updates. It still gets content added.
But since OP has already pulled the "I've been playing MMOs much longer than you, I should know" card, I already know it's going to be dismissed.
Let's not be hyperbolic and label what's happening as something it isn't. The games not in maintenance mode, you just don't like the content added. That's fine. No need to make ish up to justify how you feel.