The powers were expected... More items and powers were added, because 5e leveling up is so boring and they needed to add extra choices that players can pick from.
Be it from special weapons attacks to items - consumables or tadpole powers they all lead to the same thing, extra choices that 5e just can't provide on it's own. 5e was never made for this and it lacks choices and variety needed for video gaming. Not to mention attunement was scraped so that's an extra kick in 5e rules and it's balance. One that i actually approve of, because limiting items like that in video game is insane.
Anyway the whole thing is even more unbalanced than EA, the items video was already added btw
unbalance is everywhere be it items or powers if we add that to all the homebrew(pets, action economy...), consumables, item - story buffs, and finally resting is still unfixed and broken for a spell slot system game so the only balance the game has is fun.
One could argue fun is all you need, but i guess that's different topic.