Some of the Valkyrie nerfs are unnecessary
I think the main reason why Valkyrie's pick rate went up was because of how broken Axle is. She was the main legend that had a chance to disengage from an Axle team but even so some Axle teams had Valkyries to make sure no one gets away. Now it's mainly Loba that can disengage.
Before the Valkyrie buffs in season 27 the main complaint was that she's really just an EVAC item. So you yall buffed her ult by 15% height but now took it away. Maybe adjust her ult height based on the map but in my opinion this nerf wasn't needed. I think one of the biggest things going for her ult was to be able to fly past things that an EVAC couldn't and now she's just a tiny bit higher than an EVAC.
There's a difference between overpowered and being useful. Valkyrie tends to be one of the best solo queue characters because she allows the person to guide the team away from terrible decisions by putting them in a better position. Currently I don't even think Valkyrie's ult is good until she gets purple because she's easy to shoot down when people are near her since her ult just goes straight up and can no longer spin.