Yes, it will hurt the game overall, and yes the vast majority (~85%+) of hunters hate 9.0 Hunter’s Mark. That doesn’t matter, they made up their minds, and only overwhelmingly negative feedback in the live game will change that. Maybe patch 9.2.
The devs are largely uninterested in design feedback during betas. They never have been-- I’ve been in alphas and betas for the past several expansions, so I can say that with complete confidence. Betas are for bug reports and stress tests. If your design feedback happens to hit a dev who agrees and champions the change, it happens.
But if their minds are made up, no amount of feedback will change that during beta. Live, yes. Extremely difficult in live, and it needs to be a MASSIVE amount of negative feedback, but it’s possible. Not in beta.