Accompanying tunes with guitar actually has to be learned. People think strumming an acoustic guitar is easy, but control of volume is a skill which a lot of players undervalue. Many good vocalists spoil their own performances by playing too loud or too little variation in volume.

Th dynamic range of an acoustic guitar is one of its finest attributes but control is essential. I actually mastered fingerpicking before learning to strum anywhere near effectively.

The art of accompanying tunes is to underpin them rather than drowning them.