Earlier quoted context omitted.
I don’t think it’s unreasonable to say 2/1, 3/2, 4/3, 5/4, and 6/5 are intervals which sound pleasant to the human ear. [1] Once that is established, as per the linked article, 12-tone equal temperament makes a lot of sense (but isn’t universal, obviously) because it’s resulting tuning gives us a really close 3/2 and 4/3, and having a simple 12-tone scale reasonably in tune everyone can agree on makes sense. We can t…
> we tolerate them being slightly out of tune And in many cases we don't need to tolerate this because most instruments barring guitar and piano allow musicians to tune chords to just temperament, and players will do this automatically and completely subconsciously.
The linked article makes the case for equal temperament by showing that 12 just fifths played in sequence is flat compared to seven octaves.