I understand your sentiment, but, having been on the other side of the fence, there are a lot of people that apply for jobs they're completely unqualified for, and they end up being most of your candidate pool. (Come to think of it, this would make a decent whiteboard question about reservoir sampling without replacement...)

Another way to think about it is that these interview processes often have a ~ 1% acceptance rate, and the softball questions typically filter 80-90% of candidates.

So, yeah, it sucks for a qualified candidate if they fail half their interviews, but they'll end up getting a job somewhere. That's much better for them than working at a company where 99% of the engineers can't perform basic coding tasks or explain how products in their industry segment are designed.