Last time I've got the numbers (` Monza) there was an average of 25% less passes per car/driver compared to last year. Meaning a terrible decline, and all time low for GP racing.
But also, to make your worthwhile comparison, you'll have to remove any car from contention in any race from the past at about 104%+ of pole time.
Here is how many cars would have to be excluded at some selected Grand Prix:
1950 Britain : 6 in, 15 out. (everyone bar 4 Alfas, Prince Bira and Yves Giraud-Cabantous)
1967 Monza: 11 in , exclude 7
1971 Monza: 19 in, exclude 5
1978 Belgium: 15 in, 11 qualifiers out
1982 Britain: 17 in, exclude 9
1988 Imola : 4 in, exclude 22 qualifiers (since you won't count passes between Lotus, Virgin & HRT)
1992 France: 9 in, exclude 17 qualifiers
1994 Aida: 15 in, exclude 11 qualifiers
So, although 1971 in Monza is a good example of a similar field to today with regard to fast & slow cars, there are certain examples over history of cases where, by a consistent application of your rationale, we would have to discard any overtaking accomplished between, by or against half the field.
In fact, by your rationale, a full 22 out of 26 qualifiers for the 1988 San Marino GP were 'crapboxes'.
So stop misrepresenting statistics. You have a valid point about the effect of the Lotus, Virgin and HRT cars on the overtaking statistics, but you then cannot
compare these to the Brian W. Lawrence/Michele Merlino figures from the mid-80s as they would also have the 'crapboxes' in them, and for that reason your declaration of an all-time low is not backed up by statistics, nor does it stand up to the least rigourous analysis possible.