Here is my reaction to the auto-braking after riding the training race today. I accidentally hit 0 watts on the descent when catching up to the pack. I nearly got dropped.
I think the braking is too strong (at least for the pace we were riding at).
I’m also not convinced that the issue with drafting is the lack of brakes. I suspect lag in power reported is much more of an issue. I find if I anticipate the juncture with a group enough it’s relatively easy to catch their wheels without passing them. Also, if the speed differential is not too high the braking of the wind resistance when I come out of their draft pops me right back into the draft as long as I don’t overreact.
I would really like the auto-braking to be an option that I can turn off. I find that I would never use it and it really hurts if I want to invoke the auto-calibration of my power meter by coasting for a few seconds.