I assume most people would find a dominant dissonant. A V7 is difficult to figure out. A V9 sounds better.
To say blues doesnt sound dissonant sounds more like only adding the relative minor b5. Or British blues rock.
To say blues doesnt sound dissonant sounds more like only adding the relative minor b5. Or British blues rock.
And other cultures like tritones just fine, featuring them even more prominently.
There's no inherent "tritones are dissonant" human universal, it's a common practice harmony prejudice.
But the chord function is only one third of the picture. Dominant chords can have greater or lesser tension depending on which extensions are used. A closed voicing will sound more dissonant than an open one.