Using Blackboard Key Selectors.

So I’ve been trying to work in Blueprint to attempt and make a relatively simply AI. After a couple weeks this whole concept of blackboard key selectors is still making very little sense to me at the moment. Looking at it now I’m really wondering why we can’t just have a simple blueprint function for retrieving values from a blackboard. It could operate like the Use Blackboard function where it would find all available variables of that type, then give you a drop down menu where you could select the variable you wanted and it would return the value of the variable for you. If anyone can point me to some way to do this (Maybe it already exists and I’ve managed to look in all the wrong places for it as that has happened before) that would be really helpful, Thanks.