Totally agree 👍, the DS-5535 & AP gave us lots frustration, trip interruption, long waiting, extra cost etc. The intensive process should be left to USCIS,CBP,FBI due to the consulate limited resources.
For instance, 15-year travel history check, there is a huge work to get data from different countries such India, China ,MDEN etc, need to group a batch of cases to send out monthly or quarterly somehow. My guess that is not real time on call one by one at least
They should get rid of DS-5535 process, instead let the immigration visa applicants submit finger print to FBI or DOS to clear first as internal USCIS does. That should be not an issue since we have visa waiver to US or lived in US.