I know it has always been 3 classes but I think it would awesome to see a skill tree with all options from each class in it. Would love to ground dodge on my warlock or pop a rift with a titan and so on. You could still have 3 different types of armor so you can look like one of the classes if you wanted or mix match armors up. Think we could get some very interesting builds with this system. I don't have to many ideas on how this would work in general but think it could be fun.