Expert take
Sona is an excellent pick when you understand that she does not win through immediate intimidation, but through clean accumulation. Her gameplay requires less flashy mechanics and more discipline: do not give hook angles, choose the right Power Chord, keep auras on several allies and hold Crescendo for the moment when the enemy commits too far. She suits players who like controlling the rhythm of a fight without necessarily being the most visible champion. If your team already has structure and a carry to amplify, Sona can make every objective much harder for the enemy to contest. If the draft needs a support to take the first risk, she becomes much less reliable.