Anki is badly designed and inefficient, largely I think because it was the first project for its author. It's also become venerable and battle-tested, and features have been developed through the needs of a very large userbase.

I don't think that anyone denies that Anki could be a lot better if it were completely rewritten with the experience of having had Anki for years and knowing its pain points. You just have to have a plan, best based in analysis of Anki (and SuperMemo) to do that.

> There's definitely space for an easy to use SRS out there.

I think there's definitely even space for a hard to use SRS that's easier to deal with. But it's got to start by covering at least 80% of what Anki does already or it's not worth switching.