5th Edition D&D has a skill problem. It lies in a feature called expertise, which allows you to add your proficiency bonus twice when using a skill. Let's see what problems this causes and I'll give you a simple hack to fix them!
Eberron's new Changeling is the first class that can start with an 18 ability score at level 1. Although this "power creep" doesn't mean the class is unbalanced, the answer to rebalancing the race within the existing design paradigm may lay within cut content.
Metagaming is one issue we encounter in tabletop RPGs. Players have their characters act on player knowledge that their character does not possess. A DM's defense against this is to gently remind the player to act within the confines of character knowledge. This can lead to an overcorrection where every time a single PC finds out information, the other players ask "do you tell us that?" Any time a strange routine like this becomes habitual, we should streamline the process.
Reliable Talent makes all your skills passive. In order to see what you're really getting from this class feature, you need to find out what skills already function passively, and what skills only function actively. We'll examine passive skill treatment in the rules and analyze where each skill should fall.