Fixing the issue with blunt closures in order to close off neighborhoods is frequently bad for everyone: it increases load at the remaining ingress. The neighborhood gets saved the through traffic, but congestion is increased outside of it.
Is that something you think is actually preferable to simply avoiding sending large amounts of through traffic on roads which were not designed nor are able to handle the traffic?
That seems like a cutting off ones nose to spite one's face. I don't live in LA, nor do I personally suffer from waze traffic (in fact, I have the good fortune of having been able to select my location so that such things will never be a problem for me) ... but I've lived in Florida where it's the norm for communities to be constructed with single outlets, and its clearly a bad design that leads to more roadway congestion. Yes, it keeps neighborhoods free from being speedways, but it makes driving and the community less enjoyable for everyone else.
