The Pixel 6a may not contain all the glamorous features of the Pixel 6 and the Pixel 6 Pro, but Google claims it has a hidden benefit up its sleeve. According to Rick Osterloh, Google has equipped the Pixel 6a with a new under-display fingerprint scanner, presumably off the back of criticism about the accuracy of the one in the Pixel 6 and Pixel 6 Pro.
https://www.notebookcheck.net/Pixel-6a-Google-confirms-new-mid-range-smartphone-has-a-different-fingerprint-sensor-from-those-in-the-Pixel-6-and-Pixel-6-Pro.619512.0.html