They read feedback, but obviously they think they know what's best for the game or they wouldn't be working as developers. I think they are too stubborn lately though.
The spec overhauls have gone way too far IMO, especially for specs that were fun on live. Brewmaster on alpha is already set in place, they'll tune it to be a functional spec, but the actual feel of the spec is terrible and it's easy to want no part in testing it further. Look at Blood DKs, they'll only make incremental changes, they won't fundamentally alter the direction they chose with the alpha iteration of the spec. The fact that nerfing Purifying Brew is a perfect example of how they want decisions to be LESS meaningful, not more meaningful. They can go on and on about how low uptime on AM makes the choice more significant, but it doesn't. You'll still strive for the highest uptime possible and using abilities as they are available, you'll just be less able to achieve high uptime.
The real solution to fixing tank healing was what Troxism outlined in his Blood DK/tanking document, remove Beacon of Light and all passive tank healing that effectively completely covers all of the external healing that tanks need. Blizzard has shown no interest in taking this route, only making slight nerfs to these heals and instead choosing to heavily overhaul tanking.
If you want Brewmasters to be like 6.0 (without the overpowered part) or like they were in MoP, you're literally wasting your time by giving feedback and it's only an exercise in frustration. The fun reactive healing gameplay is gone