I think there are concerns with whatever you use in any situation. Put something up here and someone will have something negative to say about. Personally, I use KMIII for a tied bridge on my ergo, and its the best bridge Ive ever used.
If someone is concerned about taking a fall into a bridge and breaking it, then #1, dont fall like that (ie, dont allow yourself into a situation where a fall is a real concern, ie, safe work positioning practices), and #2, its probably gonna break your back or your neck if youre falling that hard and/or far into a saddle. Just my opinion, but anything and everything we do is dangerous, and no matter what you use or how you configure it, theres gonna be a concern of some type regarding it.
Personally I think a static rope or dyneema rope bridge is fine, and have no problem whatsoever climbing on one. (Neither do the possibly thousands of climbers on a warp speed bridge from Buckingham.)