Proxies are used to support advanced data binding with this helper repo: https://github.com/RisingStack/nx-observe. It allows to bind on getter/setter, inherited or expando properties and it is something that differentiates it from the others.

Browser support is coming in the future and I don't want to ditch this if I don't have too. The project is in alpha and Safari support is coming even before it will reach beta. I am grateful for all the feedback though.