Current PBE build: Lulu
Glitterlance (Q) AP ratio increased to 70% from 50%
I mean, the only thing you're going to accomplish with Q AP ratio buffs is moving Lulu into solo lanes...
Buffing AP ratios = improving their scaling = more useful with gold.
Supports aren't getting much gold, and even if they get some, they won't spend it on AP. This is because current AP support itemisation SUCKS, we have 1 legit AP support item.
Buffing damage = improving her ability to trade and most importantly TO WAVECLEAR. This is actually huge for solo lanes, not so much bot lane. Sure, damage makes her better at poke, but Lulu never was primarily poke support