It's good to keep in mind that Synology models are designed and engineered for a global market.
This is likely a more popular solution in Asian markets and various small-business focused markets as fredbert mentioned.
While it may seem underpowered to any power-user, it's a cost-efficient solution for simple backups in a small form factor rack-mount NAS. (If you're taking the value of the DSM environment into account)
They've even found enough efficiency in DSM to enable BTRFS capabilities on a few value series units such as this one. (previously only found in Intel-based plus and above models)
Just as the FlashStations don't make much sense for the vast majority of power-users, this is simply a device that is made for a specific demographic.
It's hard to fault Synology for providing a reasonable range of capability and pricing in their units. This unit is $600 USD when you already had the option of going up to the Atom-based $850+ Plus options (
RS818+/RP+) or even the Xeon-based $2k 4-bay (
RS1619xs+).