Yes it has always been in the engine and was formerly known as the solid tool. They keep improving it but most of the experienced devs stick to using it for whiteboxing. It has quite a bit of functionality now but without a decent UVing solution that isn’t based on face selection it wont give amazing results. Only one guy works on it though and for what it is and 1 guy I will say it has been updated quite steadily over time and it is not a bad tool. UDK had the same type of functionality years ago.