Then why would someone choose Control Action over Control Thoughts then? Main advantage of control thoughts is that lack of resist check, except the person is 100% aware he is being played as a puppet.
Control Thoughts allows for subtle manipulation for more covert cases, where the demands need to be reasonable, leaving the victim none the wiser if your manipulation is subtle enough to get what you want without it being a massive departure from their normal routine. Something as simple as 'Add a BCC to this address when you send your next status updates for analytics tracking' or some such BS. Sending messages in his normal daily routine and adding an address isn't extreme. Ordering them to off their wife is.
Control Action seems to be the combat version or brute force version, where it's intentionally meant to throw subtlety out the window.
Do agree it's a good idea to establish a ruling before a player takes it, or even before a GM uses it on a player, so that everyone is on same page on how that table choose to House Rule it.
Oddly enough, I find that this is one of the few places RAW and RAI seem to so closely coincide in 6e.