Ill chime in with my positives first. The added ms when stars are retracted really helps considering how many champs are unbearably hypermobile. Not only can qiyana do three dashes within 7 seconds, you have to try to miss her cc. Feels nice assuming you wanted to disengage.
On to the negatives! We can start at the beginning: early game. It feels awful. Even with Electrocute and scorch your early burst just isnt meaningful. On top of that you cant wave clear as well as before either. These combine into a weak early game. Early skirmishes highlight this as your full combo will at best peel away 1/3 of anyones health bar while you stand around awkwardly offering your teammates moral support as a consolation for how useless you will be during those 8 unbearable seconds.
I can only hope you see how this would feel cumbersome on a champ whos identity revolves around (heh, space pun) roaming. Speaking of which, I am so glad that roams are more strict. Sarcasm aside, the cooldown on comet of legend can inflate to 5 minutes like flash has for all I care. The best part of putting a point in E was the passive ms boost. Yes, it helped your macro but it opened up Asol to glide into a favorable position and was handy growing some distance similarly to the new W ms. The separate parts of the kit really fit together more so than they do now.
I never took issue with late game. Considering you had aoe dps it wasnt uncommon to top the post game damage chart. I felt the damage was sufficient and having a perma slow death circle was more than enough to compensate otherwise. I would much rather have a more impactful early game to directly dictate the flow of the game. If I wanted to farm for 15+ minutes I could just play vlad or kass. Or even pre-rework Asol!
I dont feel as though I need to touch on the rest of his kit so I wont, but let me be clear. My first main was sol who I picked up 4 years ago. I am unabashedly in favor of having his w be a toggle. Whether it does reduced damage to minions or it keeps that bursty buzzsaw speed before slowing down considerably as if to say "hey we wont force you to play a certain way but we will punish you for it" is of consequence to me. As long as I am in control of my stars the rest is unimportant.
Honestly Im just impressed not a day goes by without teemo being called the devil, yet rito banditos unironically claim they want to preserve him for the teemo mains. Meanwhile no one even bats an eye at asol and his core mechanics are stripped away. Its funny, really.