Removing Lulu's AP Bonus from Whimsy lowered her skill cap
The TL;DR version of this is that it removed a lot of potential interactions Lulu had with not only herself, but her team, thereby lowering the skill it takes to play a masterful Lulu. I would like the AP bonus back, even if she can only give it to allies; if Riot doesn't want supports to be able to buff themselves significantly.
The non TL;DR version though:
Lulu is one of my favorite champions (that I do not play nearly enough), I fell in love with her upon release and whenever I feel I can play her, I do.
I am very upset with the removal of her AP bonus from Whimsy, as it removed a lot of strategic decisions Lulu players could make about using it.
These decisions include, but are not limited to
-Duo laning with an ADC (Stop saying marksman) that has decent AP ratios to take advantage of the buff
-Choosing to buff the ADC in fights so they could be more mobile or buffing the APC so they could achieve greater damage potential
-Buffing herself to be able to chase an enemy down and land a few stronger hits of EQ to finish off a duel.
-Giving an AP top laner/jungler a better engage on top of some better damage
With the removal of this AP bonus, Lulu's Whimsy is now only really used as a speed boost when you leave base. 90% of the time, in fights, you are going to be casting it on an enemy to disable them versus having the option of disabling an enemy or increasing an AP's damage for a few moments.
This has lowered Lulu's skillcap and made her a more binary champion.
It was also really nice to give immobile mages a bit of a pick-me-up with their new found AP bonus, really helped with that whole assassin meta thing in s3.