> I think that the main difference between LotR and GoT is that LotR is told in a style similar to the actual legendary epics and epic sagas that we have from history.

Yeah, ASOIAF is very much a deliberate reaction against both the tropes (pure good vs. pure evil, characters whose morality or immorality is etched in stone disconnected from events and circumstances, etc.) and the romanticization in what is told and what is elided in the style that LotR deliberately leans into.

> This doesn't mean that LotR is less realistic

The tell vs. imply distinction isn’t a matter of realism, true, though other aspects of the difference, particularly around characterization, very much are, and those are deliberate stylistic choices on both sides.