From what I've gathered, the consular route is nowhere near immediate, especially if they are from one of the countries typically backlogged (e.g. India). You're saying that someone who gets married while on F1 + OPT/STEM should leave with their partner, potentially for months if not years, while pursuing the consular route.
No. All it leans that you go to the consulate on your appt and get your immigrant visa stamped - you get an appointment date and that’s it’s. It was a 3 hour process for me. I flew into Frankfurt and flew out the same evening.