I think the core issue with CalDAV (and by extension, the protocol it's build on top of, WebDAV) is one somewhat endemic with most W3 approved standards: it's way too overengineered to do too many things at the same time rather than a lean format.

The result is a protocol that's essentially become a furball of different ideas mashed together, which inevitably leads to the situation where a lot of services just... don't try to be full spec compliant since it's out of scope for what they actually want to do.

I don't think I've ever seen a W3 data format spec that didn't end up this way, it just always seems to happen. (It doesn't seem to happen with their lower level protocol specifications.)