I’ve seen a lot of women at a lot of gyms, doing the exact same workout routine they were given when they took their memberships. Not just the same machines/ stations, but the same weights/ loads.
And when you listen to them, you hear comments like
"I don’t see any difference" or
"I don’t think I’m getting stronger" or
"those chicken-wing arms are still flapping" and
"My stomach isn’t getting any smaller, even though I do 2-300 sit-ups every day!"
If someone was to tell them to use heavier weights, the answer is almost always the same.