PS4 Pro can play blu-ray and DVD but not 4K UHD Blu-ray nor CD. That said, I have a PS4 Pro and the disk never worked for me for movies. I didn’t even buy disc games because I assumed it wouldn’t work. I think the physical disc drives were really poor quality in the entire PS4 generation. I’ve got a PS3 slim and a PS5 we use for movies now. Good point about disc prices. Even UHD is cheap and often includes HD Blu-ray and a digital code.