Many, many professional acoustic guitar players, often singer songwriters, merely strum. I find the sound of a strummed guitar to be very unmusical. Imagine what a piano would sound like if the pianist only chuncked out chords ..... it sounds terrible and amateurish. The same applies to the guitar.
It's a technique for learning beginners and in that context is perfectly ok. I just wish seasoned, professional performers wouldn't "strum". It sounds very basic and unmusical.
Agree or disagree?