My 2015 Prius was totaled by some high schooler who was barely driving age. I liked my Prius, so I went to the boonies of Maryland and test-drove a 2013 Prius that only had 55K miles. The dealer told me it didn't have Bluetooth, that I would have to plug my phone into a USB, but that I can outfit it with a new stereo for about $250. I really enjoyed Bluetooth so I can listen to podcasts.
I bought the car, and it turns out the 2013 Prius DOES have Bluetooth. But the setup looks considerably more antiquated than my 2015 Prius. I would justify replacing the stereo if there are more features that I can use. I usually need two reasons before I do/buy something.
Are there features of car radios that you like?
I don't need to be able to listen to XM radio or anything like that. As far as content goes, podcasts are all I need.