I'm neutral.
I don't mind Stormcast being in every starter set because, as others have already said, they're a very good 'starter' army and were clearly designed from the ground up to be exactly that. Plus the start of the new edition is their only real release wave, unlike 40k where you can expect at least half a dozen variations of Loyalist Power Armour to appear in an edition so the fatigue is real. True, Stormcast do get more in that way than most armies, but it could be a lot worse.
On the other hand, having two different armies back in Fantasy was something I actually quite liked. Variety is the spice of life as they say, so having two different armies getting big new releases/updates to older sculpts is certainly nothing to scoff at.