That's a valid opinion, and one that many share. When I was a student, I noted that the teachers who were the biggest sticklers about exact meanings of terminology and insisting that words be used correctly tended to be either not active performers, or if they still performed, tended to be on the lower tiers of performance experience and ability in relation to the rest of the faculty. The better players and performers tended to think less in absolutes, and would not waste much - if any - time between the distinction between a "leading note" and a "leading tone". At least at my school, the former was not a thing and the latter was; so in the vernacular, most would likely equate the two and get on with the music. As always EEMMV.
You can bet the guys who just got on with it understood the difference, rather than just knew the difference. I think you have to go through knowing to get to understanding. Here in this thread were are concerned with knowing, which is the time to be pedantic.