Not a fan of those little white reflector toothpicks they stick on the road. Put up a real barrier, or at least a cement curb.
Human Scale
The concept of "human scale" is most known in urban design and architecture, but it provides a good framework to think about a lot of different aspects of our lives.
This community can be the place in this hyper-connected world to display and cherish the things that are not.
While they would be better, sometimes it is a lot more approachable to start small and cheap to get people to understand the benefits. It is also sometimes better to do something temporary when you know it might need adjustments to finalize the layout into something more permanent.
I think they can have their place, and that place is quick and cheap installation to test out the effects of installing bicycle infrastructure.
Long-term, they should naturally be replaced with alternatives that properly protect their users from the threat that motorists pose.
They're not there temporarily because they're cheap; they're there permanently because car-brained traffic engineers are still addicted to breakaway design.