The problem, obviously, is that big things take time to prepare. As it stands, they're essentially on par with Advent in terms of quantity of music releases, and they have had less time to get there, which is something, but not that big a deal.
But if you take what cover's saying at face value, a different picture emerges.
https://note.cover-corp.com/n/n0b72541d9f82According to this, they're going to have another full group original song this month, and several subgroup songs. If that's the pace they're aiming for, with a new original song each month and lots of collab songs, that's going to be way more original music than most branches in not a lot of time. Also according to the article, they're already preparing for 3d and doing dance lessons, which suggests a way faster timeline between debut and big 3d events than most other holos. If Cover actually pulls off what they're stating they're planning, this will be something genuinely different than any previous gen. Different enough that the usual metrics of success might not apply, and the lack of growth as a traditional holo is more than offset by large recurring spikes of interest with each big event they do.
And that if is the rub, of course. Right now all we can see from the outside is words, and all the past music focused projects Cover have tried do not have a particularly good track record. In the best case scenario, they're in the slow starting part of a potentially exponential curve, and in a year or two they will be genuinely different than any generation before them. In the worst case, the project falls apart and they probably take a path towards becoming a more normal holo like AZKi, Suisei, and Irys took, but with the uncertainty we're all talking about having stunted their initial growth to be slow and linear or even stagnant. And the problem is that there's no evidence yet to distinguish between those two cases. The only thing to do is to wait and see, and people, on the whole, are an impatient bunch.