Their in-built dissonance can sound muddy when played in the bass range. Like the Phrygian mode, much of the Locrian tension comes from its minor 2nd degree – and that’s emphasised at the ...
The ‘happiest’ sounding of the modes, the Ionian is identical to the major scale, so it’s highly likely you’re already playing it on guitar ... B Dorian, C# Phrygian and so on.