NAS boxes are subject to all of the same "unforessen" events a PC would be. Not a great argument.
Any PC can be setup with the same network shares as an NAS. There are no advantages other than an NAS box being more energy efficient.
Slow relative to what? Most modern HDDs deliver speeds north of 150MBps which is more than most storage needs require. Computers are not magically more "snappy" when HDDs are removed, especially when the system in question has an SSD as a primary/boot drive. External enclosures can be handy, but most people prefer not having drives scattered all over their desk. And bootup times are not affected by more than 1 or 2 seconds, so really?
Not fast enough. And there is nothing on the horizon that can overcome the bit density threshold wall the industry is hitting up against. QLC has gotten better, but is still unacceptable as primary storage. All research on PLC(5bit per cell) NAND is showing it to be a dead end as NAND cell durability doesn't get above double digits and speed is slower than OLD hard drives.
Anyone who dismisses and discounts a viable highend technology because of personal perception is making a mistake and needlessly limiting themselves.
I'm not limiting myself, neither did I dismiss it entirely - rather, I acknowledged HDD technology's benefits - but I also don't see the point of having spinning rust on my desktop anymore for the reasons I've outlined above. They will have their market and their place, but I strongly feel anyone building a computer today should own a dedicated NAS or use a dock instead of installing HDDs on their machine, unless their data storage requirements are pretty much extreme with very high access frequency. Of course, only you know what is best for your personal use case, and I respect that.
Hard sell on the adequate speed, IMO. 150 MB/s sequential is slower than a flagship internet connection today. It's... no good. Not anymore. Sure, it would (and does) serve my personal needs, but I use my NAS to... store and play anime. 1080p, 24 fps video, if you will. My claim of computers being snappier without HDDs installed primarily has Windows in mind. The OS is always trying to query the drives and gets stuck on a busy wait loop until the drive responds, which from a powered down HDD can take several
seconds to occur. This will likely never change.
Despite the challenges you've outlined, hasn't the HDD industry hit the same snags? How long did it take for them to get HAMR technology working? Ten years ago, when helium-filled HDDs first came out, the industry doubted that the system would be feasible. Fast forward to today, and only high-end drives use the tech. Bit-pattern HDMR technology is still not expected to be available until 2025, and almost no consumer-grade, including NAS-marketed drives feature these technologies yet, especially at the lower end of capacity and more affordable drives.
Most HDDs, in fact, have gotten simplified, lower-performing designs, favoring SMR over CMR even at low capacities with CMR designs being actually placed at a premium segment (for example, if you want a 1 TB CMR drive you have to splurge for a WD Gold), - and yet worse, many of these changes were done silently by the companies who completely omitted these changes to their customers, so it's not like only the SSD industry has run into woes of their own in the pursuit of either profit or lower cost devices.
The industry will find a way, it always does, its survival depends on it