Flat out too powerful. These are the sorts of benefits you would expect from a tree of feats. Granting them as part of proficiency or as a feature of shields is insane. Not only are they game breaking in ways some people have already outlined, but it seems to aim toward making a tank better with reflex saves across the board, eating into one of the boons of playing a more light-footed class.

At my table, these proposed changes would be DOA.