You would need to explain how and why it is unfair.
It changes the game. The rules are, however, symmetrical. The opponent could introduce the same liabilities for your defense, if they had the desire and ability.
If you want to argue that banning the tactic makes the game a better watch, I would buy that as a reason for a rule change. I tend to think that making football faster makes it a better watch, but you could easily argue that giving defenses time to substitute and set up makes for a more interesting positional game of physical chess. I would counterargue that Walsh et al more or less solved the game and that it's now a purely physical contest. We could agree that we have different preferences and beliefs, and agree to disagree over those things.
If you're arguing that Wyche's tactics were unfair, though, I would demand an explanation since the rules are symmetrical. Your argument is not self-evident for that reason, and your answer so far is grounded in your preferences over what you want to watch as best I can tell, rather than whether or not it's unfair.