A bigger problem: even within the same staff, the same notes on different octaves look different. Like, a middle E goes through the first line of the treble staff, but a high E goes between the top two lines. Music “rhymes” at octave intervals, but the staff spans a different, clashing interval.

There’s a new notation whose name I’m forgetting which resolves this problem — I’d expect it to make sight reading significantly easier to learn.