There is a lot of great music in the world written for the guitar. Lots of people never learn to read music and only play by ear. By learning to read you have quicker access to much more material. Tablature is a way to learn songs in an easy to read format and gives you access to songs more easily. It is a good idea to atleast learn basic note reading. By knowing the names of all the notes on the bass and treble clef, you are able to communicate easier with other musicians, learn music theory, teach yourself all the different scales and chords and how they are constructed, read jazz fake books, learn classical music pieces, and so much more.