One of the best reasons to wait for the Pixel 8a is for Google's excellent software support. There are two benefits to this.
First, you can expect the Pixel 8a to run Google's best version of Android 14. Expect it to get some of the features Google's put on board the Pixel 8's software.
And second, while you might be tempted to buy an older Pixel device like the Pixel 6a, software support for these devices will end earlier than support for the Pixel 8a. Fewer updates means fewer features, bug fixes, and security patches.
Google has extended seven years of Android updates to the Pixel 8 and Pixel 8 Pro and we'd expect something similar for the Pixel 8a.
If you plan on keeping your next phone for a long time, you might want to hang around and wait for the Pixel 8a.