I think I just figured out just what the problem with ALL CertainlyT champs is...
I looked at all the champs he has designed,
and now also the rework of 
Now, they are all quite different champs tho... marksmen, mages, tanks, melee fighters... just what is the unifying element in all these?
They all have some weird extra thing strapped to their kit that is purely stat related.
Darius has (not sure if he still has but he sure had) free flat armor penetration on his E. Tresh has the damage passive on his E. Zyra gets free CDR, a stat that, in that low value, feels even more hidden than normal hidden power, Yasuo on his release (initial design) had a passive on Windwall that gave him flow whenever he dashed. Oh, and ofc that crit bullshit. Kalista's extra is bound to her ally, but had to be nerfed apparently.
And Morde? Also has an extra stat passive on his W: this time with EXP, which has proven to be extremly problematic and should be scrapped ASAP in my opinion.
In most cases it would be just easier to remove that part and use the power budget somewhere else. Tresh is a CC/Utility-Tank, why would he need the damage? Why has Zyra her power budget stuffed up with this lame CDR? Why did someone strap flat armor penetration to a champion who has to do nothing to earn that? Especially one that loves building
?
Tl, dr.: I recomment riot opening a position as "designer observer" and whenever CertainlyT tacks some weird extra thing into a kit that feels extremly unneeded they slap him on his fingers and tell him to re-do the design.
Also that guy should have the job to slap Stashu once he even mentions the word "stacks"...