Well I personally find that the exclamation point kinda defeats the purpose of the stealth, not to mention that I also find that the 15% movement speed boost isn't quite adequate enough to catch up to your prey when they see the exclamation point while you're still a mile away. I also just think it would fit better thematically. Is Rengar such a bad hunter that people just know when he's coming? As for gameplay, I think that this is just a better fit. I get that old Rengar had low counterplay, but I think with this new indicator he has a bit too much counterplay for what he's designed for. With the indicator as it is it's way too easy for the support or whoever to go "Oh look. An indicator. Better go hug my adc and drop a pink ward and lol at this Rengar." If the ultimate was tweaked to where it just gave a global sound notification, then there would still be some element of surprise in the ult but there'd still be enough counterplay for the target to prepare themselves for a potential knifecat attack. Also, this would allow the Rengar to play some mind games on the enemy team by letting them all know that at any second they could get jumped on. It would introduce a new depth of gameplay where after hearing this global sound, opponents would have to play more passively before Rengar shows himself. I would really love to see this implemented and I personally think that this would make for a healthier Rengar. (though obviously I'm a bit biased)