I sort of prefer the ones without. The Kawai CA95 doesn't have it, but it does have a line input and USB/5 pin MIDI in/out, so you can simply place a tablet (iPad or Android) on the music stand and use a USB cable to play whatever digital synths or piano emulators you want to download.
Not having a built-in tablet means it is future proof and can work with the latest tablet, even a decade into the future.
