Why is everybody faster than YI now days???

Master YI is suppose to be one of the fastest champions in the game but right now I really have problem chasing down targets or sticking to them and this is what we call Mobility Creep

Last game i couldn't stick to Jhin for even 1 second

Darius runs Fleet footwork / Phase rush ( PR gives movement speed and slow resistance just like highlander) with ninja tabi and Black Cleaver and then you have the tanky damage dealer with 2 cc abilities i really have trouble sticking to as Yi

Ekko have passive that gives him 50-80% movement speed and even scales up which makes him faster than Highlander + Ghost (85 sec cooldown ability + 180 sec cooldown Summoner ability)

While i got Highlander active I cant escape from Fiora who only does Q Q Q Q Q

Not to mention champions like Vayne that is stealth champion with hard CC and disposition of enemy unit got absolutely no problem chasing her targets with her passive which is even higher during Final Hour. Vayne being Stealth also means being untargetable for Yi as well

Rengar Ult also gives him higher movement speed than Yi

and the list goes on and on

Yi is suppose to be one of fastest champions in the game and now can be outrun by most of the champions in the game. Yi got no CC, ain't tank, no utility to benefit the team like armor shred, slow stuns knock ups and so on. In order for Yi to deal damage he buys the damage, to be tanky he needs to buy the tank items but at cost of damage he would deal but some champions got the damage they need and then they build whatever they like

I don't think it's kinda fair that Mobility is suppose to be the primary attribute of Yi and nowdays (actually since nearly 2 years or so) everybody seems to be beat this primary attribute that Yi suppose to excel at which is huge mobility creep here