I have to say as well to add that many units are " culture " driven, i.e. we have always done it this way.
It only takes one or two people to start changing that culture for good or bad. Having experienced working at a unit where even a RIS was a big deal and now working at one where we do RIS and RAS without a second thought and use Class D to its maximum effect to allow zone transits I have seen it from both sides.
I am as much at fault sometimes not knowing a detail as well as i should. Ideally an expanded LARS service would help , however funding and a lack of ATCOs means it isn't going to happen in the foreseeable future.