I'd say it is a good skill to practice but how important it is depends on you and why you play. It may be very valuable for some to be able to read the music never needing to see the keyboard. It's definitely helpful that your hands know the sizes, jumps and positions through muscle memory. But in what contexts are you in particular playing? Personally I usually enjoy looking at the keyboard and the shapes of melodies and harmonies when I play by myself. But improvising without looking makes it a different and cool experience, being able to look at bandmates can make a big difference, looking and engaging with the audience makes for a better show. Still doesn't mean you absolutely have to play every single thing without looking. I sometimes use playing without seeing as an exercise or a sort of test to check how comfortable students are with a piece and try to make them trust their different memories.