Nav rerouting has been to me the single most frustrating part of Tesla's nav system. Probably everyone has experienced those really boneheaded reroutes, and the settings number doesn't seem to do much (if anything). If reroute actually works in the new update, with a reasonable confidence level, I say bring it on.
So far on 2 attempts in the Bay Area during busy commute traffic, two big thumbs up. I've yet to see a retarded reroute. For my drive home today, my phone might stay in my pocket — it's that good. Hopefully it's like that down there in SoCal too!