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Toshiba exec claims hard drives are 7X cheaper than SSDs and will continually evolve for large datacenters
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
If the NAS supports tiered storage, you benefit from high I/O performance for things like video editing.
My home storage is a NAS connected over 10GbE, I never bothered trying to play games off of it, but I'll bet they'd run great. Read & write over the network at 10 gigabit is faster on a machine with (separate) RAID arrays of SSDs and HDDs than internal SATA3 connectivity which is kind of bonkers for a home user. Plus that has virtual machines and cloud backups running on the NAS side.