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Air restrictors according to displacement & engine types had been a thing for ages before the invention of bop. In some cases the said ratios also applied to weight. That wasn't bopping, it (usually) had a mathematical formula of sorts to back it up. As in it was written in the rulebook and it couldn't be manipulated by results and whatever.

Also, in the day of the old ACO may have balanced classes against each other for overall honors (like the mentioned 1999 open-top-LMP against coupe-LMGTP) via written regulations, but they did not really balance individual cars against each other like they do today.

I would be perfectly fine if they had had two classes of options for overall wins in 2021, and these two classes would have been sort of balanced against each other through regulative methods, yet individual cars wouldn't be touched. That's not manipulation and development-killer as constant individual chassis tweaking is.