Apparently you didn't read my post very closely, as you seemed to have missed this part.
Over the years I've been following F1, I've heard commentators compare actual laps to theoretical laps numerous times, and I think i've seen some info graphics as well.
One of the reasons it's been done is to try and estimate how drivable the car is, how well it's set-up, and how well it suits the drivers "style". When everything is working well, and in harmony the driver is able to consistently drive the car at the limit, and when it isn't they can't.
Abu Dhabi 2021 Qualifying theoretical best laps using every sector form every qualifying session, vs actual best.
Ver - (1:22.098) 1:22.109 +0.011
Ham - (1:22.412) 122.480 +0.068
compared to
Per - (1:22.719) 1:22.947 +0.228
Bot - (1:22.881) 1:23.036 +0.155
Edit: Here is an official F1 article from 2020 where they compare not only sectors, but mini sectors as well.
https://www.formula1.com/en/latest/arti ... mtVte.html