It's funny how they chose to nerf Sona before everyone else
While AD champs like kayn, zed, talon are running around with 1 item built, one shotting everyone with 1000 move speed, cuz muh movespeed runes.
7 Comments
when sona can 2 shot an adc at lvl 6 as the support with support items build with actual 1000 movespeed off e [sg-janna]
league of duskblades....
[sg-ahri-3] 
easier to play champions are much more of a pain to balance and play around, literally sona just has to press a button and auto attack you and you lose near or over half your hp.
the loss of mr makes this more apparent.
All the other champs you listed have actual skill expression needed.
that's because easy to play champs only have to press like 1 or 2 buttons most of the champs you listed require some degree of skill.
have to manage shadow placement, assassinate the correct target, get out safely
has to pray there aren't any wards, otherwise same as zed, get out safely, but can do it a but easier
but meanwhile you got people like
whose only game plan is to press R