Unfortunately looks like a pitiful product refresh just for the sake of having a refresh. Synology really needs to onboard Ryzen CPUs... Just a Renoir upgrade would do wonders.

I still don't get why only gigabit NICs? I know 2.5/5 Gbit NICs aren't super common right now but they're on the horizon for consumers. I'm not sure I would want to shell out the high price these things cost without them improving this area first. Other NAS vendors have implemented them already.

Lack of cheap driver chips for them, most likely, coupled with the near complete lack of affordable high bandwidth switches. Then throw in the fact that most small businesses would rather have link redundancy than high bandwidth and that even RAID5 sets of 4 typical NAS HDDs barely make 1gbit LAN links sweat, and basically get the answer "we aren't there yet". If you really need higher speed single links, there are options available, they just aren't cheap.