Other than the scheduling features, are the "transport controls" or "trick play" parts of Amazon or Netflix not substantially representative?So I was right and you have no experience with a streaming dvr, and are basing your post off of usage of online on demand services, which is a different animal entirely.
For "heavy DVR users", "DVR" means much more than scheduling (something one could do with a VCR). It means skipping/slipping and jumping about with near-instantaneous response -- perhaps including fractional speeds and frame-by-frame stepping (reverse slo-mo seems to have mostly gone away with AVC compression).
I haven't found the right combination of programming through any single OTT service yet that is delivered in full resolution and unmangled sound so I don't subscribe to a live streaming service.