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.
I switched to Synology about six years ago (918+). The box is small, quiet, and easy to put in the rack together with the network gear. I started with 4TB drives, gradually switched to 8TB over time (drive by drive). I don't use much of their apps (mostly download station, backup, and their version of Docker to run Syncthing, plus Tailscale). But the box acts like an appliance - I basically don't need to maintain it at all; it just works.
I don't like all this stuff with vendor lock-in, so when the time comes for replacing the box, what are alternatives on par with the experience and quality I currently have with Synology?
But ok, what about just dragging a long distance where you would normally lift the mouse or finger? Is there some hidden gesture for this? Maybe once your initial drag finger hits the edge you need to use two more to do a move gesture? But I've seen that trigger scroll and/or pinch-to-zoom.