This is a consistent problem for retirement extensions, presumably for others as well. I see 6 IOs public-facing for hundreds of us every day.
Apparently, there is no suggestion box, not that they'd read/heed us anyway.
Q: If one goes w/o an appt to CW, does the queue close when a certain number of petitioners is reached??? That would be a wasted day, long trip, expensive.
Apparently, Immigration doesn't like Macs--or something. I made the mistake of using an unsupported browser (Safari), worked fine, got my OTP but got an error message when I used it. Tried Chrome, same deal. Arrggh!
A word of advice. Even if you've done this dozens of times, go to the "Document check" IO. Will save any delays or hassles.
Similarly, 90 day extension appts, sometimes needed in a bind, have one IO & few appts daily.
Jeez, these IOs are overworked! Let's face it, it's a mostly useless job. This is not where they catch any miscreants.