This has been exactly my experience too, and I've been using Instacart since day one. "Apologizing" for them often. A combination of Amazon prime now and Amazon fresh has seemed to work out.

I occasionally use Instacart just to see if its improved. But I hardly trust them to get everything I want, and I'm surprised when an order goes without a hitch. Probably not the surprise they are looking for when trying to "surprise and delight".