Just shot my modest air rifle collection with their various scopes.
At 25m, on a white card I try to hit the last pellet hole.
The 4x40 Optima on a 127 FWB Sport clusters on and around the mark.
The 6x40 Tasco on a tuned HW95 clusters tight on and in the mark.
The 3-9x45 Moonlighter on a 124 FWB Sport does the same.
The 3-9x40 Tasco on an Original 45 does the same.
The 4-12x40 AO B&L on both a Park 91 and 93 do one enlarged hole.
The 6-24x40 AO B&L on a Venom HW77 does a smal hole.
The last two Park and Venom are able to do one .177 hole, just; so its the refinement of massive magnification that can get that much precision. On rifle combinations that can't do one calibre hole then massive magnification won't fix that.
Unless I throw one.
What high mag variable can give is a tighter group if the rifle is able and the marksmanship and firing set up does its part. Shows the full potential to the combination, but also the limitations of the combo. Very High mag requires a stable platform, gives less FOV, and shows up every wobble to the point that over compensating the wobble adds to the wobble. So much sight picture movement and "lust" for precision generally means that the shot takes far longer to release. Letting your body relax fully takes an age anyhow. In the field thats not much use as at normal ranges all thats required is a solid central hit done fairly swiftly. Swiftly, not fast, as one well aimed and executed shot can't be rushed.
Anyhow, the truth is its all to do with what your intension is. High mag can only be utilised from a solid platform, without that its more of a hinderance. Choose a scope to suit the application and match the rifle, and the KISS the better.