I’ve been considering the DAS for my next device, whenever that may be. I mean, let’s be honest. 99% of the time I use the NAS it is from just this one machine. Is it worth the extra money to keep letting the HTPC connect to the NAS? Just to avoid the hassle of setting up file sharing on my desktop?
Also, there are lots of stupid apps out there, like Lightroom automatic backup, that won’t work across a network share. They do local disk only.
However, the main advantage of the NAS over the DAS for me, especially the Synology, is auto backup to the cloud. With a DAS, my desktop has to do that work itself. With a NAS, it can back itself up without my desktop giving a shit.