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Most modern, especially software companies, choose not to fix relatively small but critical problems, yet they actively employ sometimes hundreds of customer support yes-people whose job seems to be defusing customer complaints. Nothing is ever fixed anymore.
So lots of customers thought they were buying a drive that's perfect for NAS, only to discover that the drives were completely unsuitable and took days to restore, or failed alltogether. Synology had to release updates to their software to deal with the fake NAS drives, and their support was probably not happy to deal with all the angry customers who thought the problem was with Synology, and not Western Digital for selling fake NAS drives.
If you buy a drive from Synology, you know it will work, and won't secretly be a cheaper drive that's sold as NAS compatible even though it is absolutely unsuitable for NAS.
It was simple, it just worked, and I didn't have to think about it.
* TB SDDS - a multi-type phenomenon of Drobo units suddenly failing. There were three 'types' of SDDS I and a colleague discovered - "Type A" power management IC failures, "Type B" unexplainable lockups and catatonia, and "Type C" failed batteries. Type B units' SOCs have power and clock go in and nothing going out.
The killer feature for me is the app ecosystem. I have a very old 8-bay Synology NAS and have it setup in just a few clicks to backup my dropbox, my MS365 accounts, my Google business accounts, do redundant backup to external drive, backup important folders to cloud, and it was also doing automated torrent downloads of TV series.
These apps, and more (like family photos, video server, etc), make the NAS a true hub for everything data-related, not just for storing local files.
I can understand Synology going this way, it puts more money in their pocket, and as a customer in professional environment, I'm ok to pay a premium for their approved drives if it gives me an additional level of warranty and (perceived) safety.
But enforcing this accross models used by home or soho users is dumb and will affect the good will of so many like me, who both used to buy Synology for home and were also recommending/purchasing the brand at work.
This is a tech product, don't destroy your tech fanbase.
I would rather Synology kept a list of drives to avoid based on user experience, and offer their Synology-specific drives with a generous warranty for pro environments. Hel, I would be ok with sharing stats about drive performance so they could build a useful database for all.
They way they reduce the performance of their system to penalise non-synology rebranded drives is bascially a slap in the face of their customers. Make it a setting and let the user choose to use the NAS their bought to its full capabilities.