It's not the exact interaction that makes it (in my opinion) unbalanced. It is what that interaction allows. A lot of abilities interact with the attack action, like two-weapon fighting, flurry of blows, Press the attack, shield focus, Daring charge, and Commanding Presence etc. The list just...
oh wow, cool. I didn't expect to get a staff member clarifying. thanks! That clears it up! I guess I will just have to keep dealing with it that way.
Also thanks to everyone else for your input and clarification. As lichmaster mentioned, I am probably to use to the clearer tags of older systems...
I have read through several threads regarding related subjects but I am hoping to get down to the core of this issue:
Many maneuvers that take an action. "Using a combat maneuver requires spending one or more exertion points and either a bonus action, reaction, or action."
Many also say that...
I am hoping this has already been answered and I just missed it. It can be tricky to search for a5e questions.
The bard, in both my book and on a5e.tools at 9th level (edit: also level 15 I just realized) says it should get an archetype feature. However, no bard subclass has a 9th-level feature...