Factor in the concept of "focus breathing", where the effective focal length of the lens depends, to a degree, on the distance to the subject, and the whole concept becomes fairly academic
I have a Tamron a/f 18-200mm, also a selection of primes, by the same manufacturer, covering many of the same focal lengths.
Other than at infinity, the coverage by the one, set at a specific focal length, often only compares to coverage by a prime of the same focal length, at a fairly basic level … well within the variance incurred by the range of options presented by the camera(s)!