I had asked these before - Ganka gave me a good answer then: Night owl and scuba cacher require you to manually tag your caches as such in GSAK. Project GC provide a GSAK-like data base for everyone - and you and I want to be able to examine other peoples stats. Therefore they have to be manually entered for everybody. Obviously we need a standardised way to tag the cache itself. The night cache attribute does not reliably flagging a night cache (and exactly what is a night cache anyway?) and the scuba cacher doesn't cover all underwater cache possibilities. No standardised way exists. Sad.
Waymark and Benchmark, while administered via Groundspeak, are not geocaching cache types. In other words, they are not geocaches.