It only adds weight/bulk to your binding if your binding wasn't designed properly in the first place
Honestly, I am stoked for GripWalk. Here's why:
1. You get more way tread and traction than what the alpine norm allows for. This is not insignificant when boot packing and climbing around on slippery terrain.
2. Basically all bindings from commercial race up to freeride are GripWalk compatible next year. This means that I can officialy use one boot from everything from pin bindings to 2-piece/flat mount bindings to system bindings. So, whether I use a Backland 117 ski or a Redster G9, I can use my Ultra XTD 130s and not have to adjust the toe height or cram my boot into a toe piece that was alpine-only before.
3. Better power transfer than a full rubber sole. Part of the reason why full-on touring boots don't ski as well as alpine boots is because you are standing on 4-6mm of soft rubber and the sole compresses while initiating a turn. Integrating a hard AFD into the sole prevents this compression from occurring and your 130 plastic performs as it should.