Why rework Sona when you didn't even adress her issues?
Back when Fearless made the thread about what Sona could use, I had high hopes that she would be changed in a positive way: both raising her skill floor and offering more ways to support than just be an aura bot.
"Things that need to be more awesome:
Sonas auras are powerful, but not satisfying to use, and create very little interaction. Sonas basic abilities dont have as much skill expression as many other supports. "
So she no longer just QWEQWEQWEQWE to always have 3 stat auras up, which is good, but she's still not very interactive in lane.
I think her Q is what should have been changed and made a skillshot. It's clear you don't like targeted poke (as you said you nerfed her because she did well against things she counters..) I guess you wanted to keep her as an 'easy' champion just because.
Another gripe I have is that her W is still auto targeted as well. Why not let players choose who they heal? There's been many times where I would have rather healed someone else, but a high flat hp target was picked because their percentage was lower.
Her E is improved pretty well, if you build truckloads of AP. In general you have to build a lot of AP to be useful at all past laning phase.
Tl;dr the rework feels half assed (sorry Fearless) and I'd like to see another go at it once high priority champions get their updates.