Time ago I learned about the backbeat used in most present-day pieces of popular styles such as pop and rock, and indeed it was quite obvious to me it's used for the accompaniment instruments (mostly drums, but also sometimes the accompaniment guitar, etc.), but I still heard the lead voice and instruments accenting the on-beats.
Recently a teacher told me about the backbeat being used in practically all current popular pieces basically for all the instruments/voice, and I just can't wrap my head around it, that's not at all what I hear; unlike what I assumed at first, it sounds to me the accented beats can vary quite a bit for lead instruments in a single piece, but definitely not practically all accent the off beat, not even most of them.
Is the off-beat accentuation/backbeat in current popular music used mostly for percussion and accompaniment instruments, or is it actually used mostly for all instruments?