Maybe you could give your thoughts on this, as I've said it many times as have other people but you haven't responded with your thoughts on our position. Just asked the question on each thread. Her issue isn't her support style. Yes, poke supports aren't as meta because tank supports are in at the moment, but poke supports have been in since Sona's rework, yet Sona has either been oppressive and nerfed hard, or weak in higher level play.
Her issue is everything she does scales off AP. Before she had a utility floor that scaled off teammate purchases and stats, not her own gold. This created a floor that allowed her to vary her build based on what she needed in that specific instance. She could build aura items with some mitigation and act as a flag bearer almost, pushing her team on with useful easy to tune auras or build AP and be a burst mage with utility effects in her downtime. In the early game she would have to bounce auras slower, and manage her stances, and in frantic fights, she could cycle her auras, giving her teamates the full benefit of them all, while managing her power chord and getting the appropriate effect.
Currently she has to build AP, everything scales off of it. She has no utility floor, and her abilities are all balanced on the fact that she must build AP, because when they weren't, she could build pure AP and get massive damage and utility at the same time. There is no differentiation between her mage spell damage playstyle and her utility support playstyle as they both need the same stats, so building for one builds for both.
It's not a balanceable situation, so what you end up with is a champion that is easy to play because of the PBAoE auto targeting effects, that dramatically falls off based on opponent awareness of her abilities, and allies willingness or ability to stay close.
When the enemy is aware of what Sona can do, Sona can't do anything, because her ratio's and bases were nerfed so they wouldn't be a problem with her new scaling identity. Issue is she's not strong enough without those items to face her opponent without them. When she get's them she isn't even a "Hyper-support" as her ratios and effects were made to scale appropriately with items rather than strongly to compensate for her weak early game.
What Sona used to be, for me at least, was the ultimate buff support. And a surprisingly deep one that had a ton of little things you would pick up on as you got better. She had poke, but she brought more buffs to the team than any other support. I was able to work on proper positioning in teamfights, managing ability chains and decision making to decide which power chord I would want to use rather than just spamming QWEAAQWEAAQWEAA and wondering why my powerchord wasn't doing as much damage as I thought it should.
Not unrelated, but undirected, if (nontargeted) you don't understand why Sona's powerchord wouldn't do a lot of damage in the described situation you're one of the players that thought she was just a depthless champion that took no thought.
Current Sona's AoE's are 350 range IIRC, Soraka's W was 450 range and it was buffed as it was realized that her trying to get that close to the frontline to buff an ally wasn't a reasonable expectation. Additionally there is less ability management incentive to the new effects as the effects are so short lived. Because the new effects are one off consumable, or short duration, you don't incentivize intelligent usage, instead simply try to get the most effect on your team as possible as there is no penalty to not doing so.
This really is a situation where previous healthy gameplay that was enjoyed by many players, even if it isn't the type of mechanic that Riot likes, should transcend intention. This is a rework that should be reverted. It really feels like healthy gameplay was made unbalanceable, unique gameplay was lost, and a playstyle that was enjoyed by many was deleted because the rework crew didn't like it and got a chance to do so.