There are many dull periods in history where the suppression of new ideas held up progress. The Inquisition burned books and drove science out of southern Europe to the benefit of northerners. Nowadays, I'd like to argue that a pointless conformity in western theoretical physics is suppressing badly-needed alternatives to standard physics.
As an example: four months ago I published a paper in the scientific literature that derives gravity in a new way from quantum mechanics (see reference below). Something very new. I'm not saying I'm right, I simply don't know yet, but what I would say is that it is interesting and unique, maybe useful, and crucially: already published. I uploaded this paper to the arXiv, hoping to stimulate some useful debate, which I badly need to further build on it, and four months later anonymous people are still mulling over whether to include or reject it, as if the arXiv is its own journal.
The arXiv is a kind of 'public library' that is supposed to reflect what goes on in the scientific community and make it freely available to all, a noble goal, unless it becomes hijacked by a anonymous group with a bias, in which case the arXiv becomes something else entirely: a way for a biased minority to steer the scientific community their way, circumventing the proper evidence-based scientific debate (this avoidance is useful if you have no evidence at all).
I doubt anyone from the arXiv understands the long-term negative impact of what they are doing, I'm sure they are content to be in the 'cool' crowd, but standard/current physics is provably wrong: it only predicts 4% of the cosmos, it is not even self-consistent, as Einstein knew way back in 1935. The suppression of un-cool alternatives simply delays progress, and game-changing technologies we might have had sooner will be lost, perhaps for decades.
On the other hand if the arXiv return to their job, and objectively reflect all the debates occuring in the scientific peer-reviewed literature then theoretical physics can only gain: it may even cease debating cool but untestable and useless subjects like the interior of black holes and will become evidence-based and scientific again. Inevitably this will make it more useful, practical and interesting.
My, maybe flawed, but interesting paper was published in Astrophysics and Space Science and is: here.