1) has tenuous relevance at best 2) The 80 or 66 char or whatever is literally a non-science driven designer rule of thumb that's actually the opposite conclus

1) has tenuous relevance at best 2) The 80 or 66 char or whatever is literally a non-science driven designer rule of thumb that's actually the opposite conclusion from results of actual research into the issue (granted it's not exactly a deeply studied niche but there is research).