鋼琴也是一種樂器，是表現不同風格音樂的工具，難道非要用調律儀來束縛鋼琴音樂這種藝術嗎？

you can think of it in the other way: if you don't polish and fix the piano it won't be the same as you first buy it.
調音 is actually maintain the high quality, just like people need to set up the laws to protect the others.

yes, it"s right...
no more common.....