It’d be interesting to see how much oil you need to change the oil on your 2.5T?
Obviously that would depend on where he prefers the oil level to be on the dipstick.
For some reason I can't seem to find the previously available approximate oil capacity listed in the 2020 CX-5 owner's manual or my 2018 CX-9 owner's manual (both online versions), but logically, an approximation makes the most sense based on both user preference and the range considered "OK" between the MAX and MIN marks on the dipstick. When you also consider other factors like drain time, oil dilution/consumption, prefilling the oil filter, etc., an approximation makes the most sense.
You can say the same about torque specs, to a degree. Stating a range instead of a specific value accounts for the variance in accuracy that some consumer-level torque wrenches may have, as well as any variances that may occur from a torque wrench that may not be calibrated perfectly. It would make sense to assign a hard value if the instructions stated to use a torque wrench that has been verified to be correctly calibrated and accurate to the in/lb, but they do not.