Just because it's the year 2021AD doesn't mean everything will be smooth sailing. We've been around for thousands upon thousands of years, and (modern) technology has only really picked up in the last 2, 3 decades. They've been testing for a while now (hence how DTG have given Rivet a list of things to look at, and a few things (like the door sounds being wrong on the 1sy preview) have been fixed already), and it's always possible that has just cropped up last minute. To take this back to the "it's 2021!" arguement, How wasn't modern technology developed until (in the overall timescale of humanity) recently?