Not every dev is compiling code to run on a devkit
Depends on the studio. There will be a lead platform, and if that platform is a console, then a majority will run on a devkit.
surely they are not running a new build every day.
In the studio I worked in, we ran new builds almost twice a day. That doesn't include the iterative changes you make if you are a programmer. If you don't run new builds contantly, that means you aren't doing any actual work if you are on the engineering side. If you are in art you might not really screw around with too many builds. If you are a director or producer, you might not either if you're bad at your job.
Maybe the tools have changed since last I worked in the industry (or maybe we weren't good at using all the features), but I never saw that anyone had remote access to the devkits. I could remote into my workstation, but it surely was not the best way to work.