Basically, yes. Triads make for a great 2nd guitar part, adding harmonic layers and textures.
Say what?
My mantra: learn songs, learn songs, learn songs.
Why do you not want to learn and play songs? If your interest in in writing songs then learning songs will make you a better writer. If your interest is in playing lead guitar and improvisation then learning songs will help you better understand harmonic movement, rhythmic groove and melodic feel.
Can I point you to this topic also: Triads & Soloing & Targeting Chord Tones Part 1 - getting started