Where is the line drawn when it comes to allowed exploits?

[Raccoon Shinobi]

I was just in a game of TTT on gm_construct, a player had gotten to the top of a building and was the last innocent alive. none of us traitors had blink, so we attempted to use the mage's levitate to get to the top. we both died of fall damage however, leaving only zombies to attempt to kill the last Innocent. I was then informed that the zombies would just had to kill themselves. why exactly are items (that aren't traitor or detective only) that allow people to get to unreachable spots allowed? It gives people an unfair advantage over newer players, or those with severe limitations.