What exactly is the information you're looking for. Connected speed can refer to a few different things all of varying value:
- The maximum theoretical speed of the client's capabilities (for example, that it's a 2 stream 802.11ac client on a 80MHz channel therefore 867mbps)
- The last MCS rate that the AP used when talking to the client (download from the client's perspective)
- The last MCS rate the client used talking to the AP (upload, from the client's perspective)
IMO None of these are very useful pieces of information. #2 and #3 are instantaneous readings, and both due to Beamflex as well as how any rate control algorithm works, the AP and client are trying many different transmit speeds that may or may not correlate to actual throughput, in an attempt to find the best setting. What it shows on the screen is just one reading out of thousands of packets that could've been interchanged during the time it takes for that page to load. Not really much of a data point. #1 is somewhat useful in understanding a client's capabilities but that's also information you can get from just experience and knowing what device the customer is using.
(By the way, even if the user interface no longer has this info, there are CLI commands that can get you access to this kind of data or more. It's just whether or not it's actually useful is highly questionable in my opinion.)