It used to be believed that intensity was basically irreplaceable, but more and better studies have shown extremely similar effects from lower intensity, approximately down to 60-65% of your 1 rep max, whereas a 4 or 5 rep scheme is going to be around 80-85% your 1 rep max.
You can see that the difference isn’t huge even when going down to much lower loads. So the difference between 60 and 80% intensity is unlikely to be very large.
Can you list some of those studies?
https://journals.lww.com/nsca-jscr/fulltext/2017/12000/strength_and_hypertrophy_adaptations_between_low_.31.aspx
You can see that the difference isn’t huge even when going down to much lower loads. So the difference between 60 and 80% intensity is unlikely to be very large.