Thank you for the replies.
I think the main thing is (being new to the use of CGC Signature Series witnesses), I'd like to see the process improved:
I think it would be good if all signatures were "observed," especially if CGC is stating, "at comic cons or other authorized events, a CGC Witness or Facilitator will accompany the Collector to observe the signature(s)" (https://www.cgccomics.com/signature-series/).
When I have seen CGC witnesses accompany someone to visit an artist for a signature (or used one myself), I was left with a good impression. However, seeing how this one table was handling CGC signatures made me wonder if others had similar experiences elsewhere.
When I brought this issue up to a CGC representative during the show, I was told witnesses are assigned to the table, but the table may not be allowing CGC witnesses to be in that close proximity (don't remember the exact words). This person did not seem overly concerned there was a chance the signatures were not being observed.
If you have any suggestions who I should speak to at CGC, I'd appreciate it.