And for all that, your mines are still just counted as frigates so anything can be done to them. Entrenchment mines can have their own entity type (SpaceMine) so you can restrict ability usage to target only mines, or to exclude mines. And since they're an entity, you can still stick a bunch of abilities on it.
but anyways yeah i know enchrenchment will have some cool things but not everyone will get it and this is a way to for people without it have them
Sure. But saying "why is everyone so excited about Entrenchment mines, you can do them now!" is like saying "Why is everyone excited about the brand new car, I can have your horse cart!"