Agreed, intention is one you do want to leave for post match scrutiny.
Terminology is key here so why not about forget the intentional / unintentional terms and move to a more simplified concept; call it , the fcukwittery scale if you want.
EG; so punching, hitting, cheap shots, leading with a shoulder, forearm to head, blatant neckroll (so all neck/head and nothing but neck/head), stomping, eye gouging. late hit or taking players out in a dangerous way (and I don't care how they land, its what how you could have potentially injured them - unlike the current rule that is akin to you stabbed a person, but you missed the vital organs so they survived so its ok to play on!) etc. all are a slam dunk regardless. Its foul play so you don't deserve to be on the field principle.
The moment "mitigation" enters the conversation, or its not clear cut, there are elements or factors and there is possible doubt, its orange and its dealt with after the game.
The other part I would like is foul play related high/ head clashes, blood, injury etc treated evenly. So, if a players takes out your #10, gets a card for it (yellow/ orange/red) with a high shot and the #10 has to go off for a head check then cant return it can turn a game. Yes, the infringing team might suffer through a yellow, orange period, even red, but it still may be a greater loss to the team losing a #10 or other similarly critical player. So if we could have equivalent time off field for his direct opposite it balances it out even for both teams.