some was report that their had not soldered port, but support feature on firmware.
if thats true - you can manually put port on PCB if you wish, but 955x CPU power isn't make any filesystem transer really well-performing, regardless protocol and storage used.
i was just looked at one, sitting behind mine and seems nothing behind "USB"-labeled plastic cover. its still warranty-covered so i try disasebly it later to check
someone with fiber-optic devices can look inside their, but i can't had any of such
as for hEX performance - if you reading tables in device description - keep in mind that average consumer - somewhere "in middle" in terms of both used config, traffic fragmentation, pps and actual demands/expectations.
so even in worst case - you atleast guarantee thats 100Mbs interfaces will be ALWAYS saturated, which isn't happen on previous 74k devices from MT. some was reported numbers between 200-400 as "usual", but you shouldn't expect much from $60 device.
generally its nearly 3x faster than 951g or fat 2011 subversions for comparison and to my surprise.
also 8337 switch chip are really good. all latest versions, with or without hardware nat support. one of last - also support things like MacSec and PortSec, but RouterOS didn't support much 802.1x features for Ethernet interfaces yet, to my surprise.
cuz its specifically-designed thing for endpoint security of connectivity and had several extensions(aside mentioned above) to increase both security and reliability of such.
but 74k golden era is gone, anyway, in my opinion. so far Ubicom-based SoC was fill that gap better, but Qualcomm not considering invest into R&D of new chips of this arch/SDK or using them, sadly, yet. fine fine-grained(less latency and harder real-time) "supervisor" core/process in their SDK/firmware that would be unbelievable cool devices in terms of die/latency/price/consumption/scalability ratio/mix. and sad to see this IP collecting dust, unused, thus.