Hi Goldorak. I have not flown intra-European since the pandemic, so I try to understand what is the current setup.

In the old days, when you flew from say AMS or FRA, you did not leave Schengen. Hence, you remained "domestic" when you arrived at CDG. Then you had to cross French borders (PAF) to get onto your ex-Schengen flight. It might be airside in terms of security check, but you were not in international airside. For example, a European ID card was sufficient to travel within Europe. But you had to exit France to ex-EU through the passport check by PAF.
Are you suggesting that there is nw no PAF passport check for Schengen-transit pax when you exit France to go say to US?

If there is, then I do not see why there no possible enforcement for transit pax.

The rule seems clear to me that France adopted an EU vision and does not discriminate between French and EU residents. Any EU resident, in transit or not, who wishes to exit EU through France must have a compelling reason or reside abroad. PAF can enforce it as they have done in some cases.

Of course, I agree with you that they are likely not to enforce it, in part because it is so complex and they are not zealous. Or they might have received some flexibility instructions for non-French residents.
But I would be careful not to be arrogant ("I know better than you") with a PAF officer who is in bad mood, as the text he/she has seems to indicate that boarding can be denied