Printing a boarding pass at home works for the flight out. But what about the returning flight?

Just last week I flew back home from SFO. I needed to change the flight at the last minute. The app failed to update with the new flight. The airline had removed all the boarding pass kiosks from that airport and only seemed to have luggage drop service. I asked an airport employee how I could get a boarding pass printed, and he pointed to a poorly-marked lane with a sign about "special accommodations" or something, like I was blind. I waited in that line for about 20 minutes along with people who were trying to check their bags. Eventually I got to someone who seemed really put out that I hadn't checked in yet and that they'd need to push a few more buttons on their computer to do that for me.