What measurable benefit would convince you though? Isn’t the most important thing how the bike feels when you’re riding it (unless you’re racing)?
Ok, so my reference bike of old – 26″ Ti race hardtail. Feels very different according to wheel and tyre set up.
Light race tyres make it feel much more skittish and lively, harder to control, easier to run wide, but feels like the bike is alive with accerleration – always ready to pick up the pace in an instant – provided your heart and lungs can keep up (often not… 😥 )
Add light race wheels and the effect is magnified. Add heavy wheels, or big 2.3 tyres and the bike feels sluggish, much harder work.
Now, this “feel” is easy for the rider to recognise…
… the “feel” also links back to what the physics says – lighter rotating weight will take less effort to accelerate to a given velocity…
As they say, you “cannae change th’ laws o’ physics”