The problem for me is that you become attuned to how your engine sounds and feels quite quickly, which means if I'm trickling along on beautiful lanes and tracks at 2,500 to 3,500 revs on a barely open throttle looking at the scenery, or doing something similar through towns and villages, that burble becomes the norm.
Then when I accelerate out onto a bigger, faster road the new busy-ness of the engine makes me reach for 7th as soon as I'm up to cruising speed.
This is nothing to do with lack of skill or experience, it's just how our ears compensate for new normals. Ask any studio sound engineer, there's an extremely limited time window in which we can maintain objectivity.
Of course if you always ride in a similar style on similar roads this doesn't apply, but some people's need for at a least a top gear indicator is not because they're idiots.