Curious, do you guys in the studio situation actually constantly change out hardware to see what "sounds best"?
When it comes to speakers, yes there can be some evaluation of different speakers when setting up a studio. (I've not been involved in that personally). Some involving sighted impressions, along with looking at the specs, and ultimately the studios are generally set up, pinked etc by professional acousticians. It all depends on the place and the people.
But if you are talking about cables and that kind of tweaky thing, no. Though there are *some* strains of auidophilia to be found among some mixers, engineers, people who work in studios etc. Often that will be more about what a mixer or engineer chooses to listen to at home (I've known a number who have audiophile type systems/tendencies, if not going full snake oil though). We used to do "lunch breaks" where we'd all go to the local High End audio store and audition stuff. Occasionally that finds it's way in to the studio (I remember one place for music production had a tube amp commissioned to be built by a local guy).
But for the most part, pros in the studios don't go in for the usual snake oil.
I had many of my cables for my own 2 channel home system, and first home theater, made by the same person who cables our studios.
I'm sure this answer will vary based on someone else's experience in the industry.