In defense of the PlayStation vita the PlayStation vita did have a nice handful of solid physical game releases and digital game releases. You could also play nearly every psp game on the PlayStation vita via digitally purchased and downloaded off the PlayStation store. Also the PlayStation vita had features like remote play with PlayStation 4 that let you stream ps4 games on the PlayStation vita and act like controller for PlayStation 4 amongs other useful features and functionality.
Many gamers haven't fully explored each PlayStation gaming platform because if they did they'd realize many features and functionalities and even some games both exclusive non exclusive carried over to each PlayStation platform.