i dont think that tahm is op but

for someone who basicaly gives his allies a free zhonyas and can even carry them out to safety he is realy destructive for certain folks

and the thing isnt realy much of his fault its just how zhonya works in our game ... its niche and place zhonya is an item meant to break agression of champions who specialize in agression ... using zhonyya usualy means that those champions are put on a long cooldown during which they cant compete much into their game as their power is usualy tied into big moves with big cooldowns ... but zhonya has a weakness as it roots you in place ... so even if it stops you for 3 seconds you arent totaly screwed .. you just need to work with your team to kill the golden guy

imagine enemy has zed and you have tahm ... basicaly one less enemy to worry about because that zed cant ult anyone and most of his kill potential if not all of it comes from his ult post early game ... and enemy team cant just collapse on the carry that tahm ate

also there are uncounterable skills like vi's ultimate ... the thing is that all that vi realy does is ult people ... her only true trait is the uncounterable ult ... an ability that can stop that one specific ability can realy skewer the ballance of a fight

tahm as a champion doesnt cause games to go broken as his kit isnt as well rounded as champions released lately who have everything a champion can possibly have ... and some more cause certainlyT knows what he is doing .... kappa

tahm is a good champion design wise ... but he is too much of a game destroyer towards certain champions ... champions who rely on singe big moves that are ballaced in coordination of the cooldown of the item zhonya not the one tahm kench offers

in the end i think that tahm shouldnt be realy touched ballance wise, he is fine as he is... but champions who get rekt by zhonyas need some new way to interact with him as he can be a total counterpick to certain folks like vi zed malza ww totaly removing their options to compete into a game

tl:dr tahm counters certain champions too hard .... basicaly removing them from the game those guys should get something ... im just not sure what ... that would allow them to interact with tahm