Comment by Aurornis
I would also prefer having a large number of high capacity SSDs so I could replace my spinning hard drives.
But even the cheapest high capacity SSD deals are still a lot more expensive than hard drive array.
I’ll continue replacing failing hard drives for a few more years. For me that has meant zero replacements over a decade, though I planned for a 5% annual failure rate and have a spare drive in the case ready to go. I could replace a failed drive from the array in the time takes to shut down, swap a cable to the spare drive, and boot up again.
SSDs also need to be examined for power loss protection. The results with consumer drives are mixed and it’s hard to find good info about how common drives behave. Getting enterprise grade drives with guaranteed PLP from large on-onboard capacitors is ideal, but those are expensive. Spinning hard drives have the benefit of using their rotational inertia to power the drive long enough to finish outstanding writes.
This is going to be a huge anecdote but all the consumer SSD I've had has been dramatically less reliable than HDDs. I've gone through dozens of little SATA and M2 drives and almost every single one of them has failed when put into any kind of server workload. However most of the HDDs I have from the last 10 years are still going strong despite sitting in my NAS and spinning that entire time.
After going deep on the spec sheets and realizing that all but the best consumer drives have miserably low DWPD numbers I switched to enterprise (U.2 style) two years ago. I slam them with logs, metrics data, backups, frequent writes and data transfers, and have had 0 failures.