Fan backlash to a cancellation has convinced execs to renew a series here and there (but usually those were cases where the cancellation was on the fence anyway), but that's about it.
There is no history to show a fandom whining about uniforms and alien designs "forcing" execs to change them.
That said, I do think the complaints about the Discovery ship design did have an effect on the final design. But emotionally-driven angry ranting isn't what's going to get producers attention. Only constructive criticism, and feedback based in logical and rational points have any chance of getting heard and responded to.
There is no history to show a fandom whining about uniforms and alien designs "forcing" execs to change them.
That said, I do think the complaints about the Discovery ship design did have an effect on the final design. But emotionally-driven angry ranting isn't what's going to get producers attention. Only constructive criticism, and feedback based in logical and rational points have any chance of getting heard and responded to.