You could make that argument with the Legion iteration of Edge of Insanity since it increased your damage when at the max Insanity threshold, which presented a more controlled playstyle because not going into Voidform as soon as possible wasn't as punishing. What they realized with Shadow in BFA was that Voidform had been stripped of most of its benefits and so the Legion design of Edge of Insanity wouldn't work; there would be no incentive to go into Voidform. So they slapped a damage reduction on it instead because they probably couldn't be arsed to completely redesign the talent or get rid of it and come up with a new talent. They never anticipated that it would create a playstyle where you literally never want to go into Voidform because the defense that Edge of Insanity gives is just that broken, and without it the spec is too squishy.
The thought process here wasn't to provide a 'non-Voidform' playstyle. Blizzard isn't happy with the way Edge of Insanity functions right now, I can categorically tell you this. People play with it because it makes you stupidly tanky due to the numbers on it, it has absolutely zero to do with what you're saying.
Moving the goalposts by saying "it doesn't change a thing!" when you've repeatedly used it as arguments as for why you think the spec is shit is questionable to say the least. Shadow Crash and Dark Void also never simmed ahead (let alone by that much) once we figured out our apl, which has been accurate since the launch of the expansion. I'll just copy and paste this to you again: Even if Dark Void and Shadow Crash were the best ST options on their respective rows, it would be entirely irrelevant to Blizzard because both the 45 and 75 row are themed to have talents that scale with additional targets. Every talent on both rows fits that theme. There is no dedicated ST talent.