Tryndamere's ult should be a passive

It is common knowledge for any Tryndamere that is not garbage that sometimes you cannot win a fight, and thus should strategically hold your ult. This enables you to immediately start splitpushing while also forcing them to continue 1v2/3/4/5'ing you because you still have the threat of your ult, and thus allowing your team to control the map while they are occupied with this. Therefore, if his ult were a passive effect that activated automatically, the insignificant margin of error would be eliminated and the Tryndamere would have to find things to do other than force the enemy to send so many people that the fight is unwinnable but his team has a massive number advantage. He would have periods of 30 or 40 seconds where he is not a threat to the enemy team since his ult was forced to pop in a situation that he could not realistically win.