rocketslaydoesn't the crossbow ruin the "health counting" meta just as much because you can heal someone across the map instantly for 150?
I don't necessarily think so. This is because I think it is now easy to see, hear or tell when a player has gotten arrowed, thanks to the visual and audio cues the arrow makes when it lands on a damaged friendly, or even the fact that a player could be standing statue still in order to receive and arrow could give that away. Plus, you will always be able to tell that players who have gotten crossbowed are now at least at 100-150 health, or they are 100-150 health greater than they were before (minus any buffs).
When I say that the solemn vow ruins the health counting metagame, I mean that it makes the skill of keeping track of the enemy players' health pool that so many players have learnt and mastered completely useless now. Worse yet, teams that decide not to run a solemn vow should it be unbanned will still have to keep track of all that stuff, which no team would do, 'cos why make your job harder?