Why are they nerfing Trynd’s e ratio down 20% and compensating by reducing the Cooldown by 1 second. They’re nerfing AP Trynd which isn’t broken but fun by quite a bit and his normal build path gives 40% cdr. His e will be on a 4.8 cd from 5.4 and he gets e cd back 2 seconds from critting. So from three aa to three aa.
It's the opposite direction.
They're buffing his E because its the most meaningful increase in effectiveness for Trynd that isn't ridiculously frustrating (like say, buffing his R in literally any way.)
HOWEVER past experience shows that when you reduce his E cooldown even slightly, his AP build becomes obnoxious due to 
or whatever and he can't be chased. Literally what happened last time they made changes to Tryn and they had to revert it.
Becausce it's a buff Tryndamere is a AD champion They needed to buff him , so they buffed his E CD and nerfed AP so he won't abuse AP build
In other words It was a smart buff
because ap trynda is an absolute tumor to play against
Because Riot wants to tell us Trynd players "Stop building ap, please. He's an AD Skirmisher who has very little cdr, not a spam mage."
Some trynd players would go like a full ad crit build but get one extra nashors in there for more cdr attack speed and for the healing stuff.
Because its a buff to AD trynd with a minimal adjustment for AP.
Because Riot wants to nerf the 
combo before it has a chance to become meta.
This is a big buff to Tryndamare, it actually requires 2 aa now after some items and if you get lucky crits. AP Tryndamere is non-existent, so i don't see why you are complaining.
this champ should not be touched until his rework so i dont understand the changes at all
Then this means that his Lethality Tryndamere crit + Spear of shojin is going to be even more obnoxious.
