In many formulations of Bohmian mechanics, researchers seem to claim that 1) measurements of observables such as spin are just measurements of the position of a pointer variable, such as the Stern-Gerlach experiment apparatus and 2) measurements of position reveal the position of particles. This effectively removes the 'measurement problem', where superpositions of classical pointers can be explained.
However, this explanation seems to be insufficient. There exists the (philosophical) question of why the position is such an important variable - in classical mechanics, the position and the momentum are considered the state of a system. Even worse, position-measuring apparatus, such as the screen in the double slit experiment, obviously perturb physical quantities such as momentum. How is it that we can say measurement reveals the exact position, but perturbs other variables? Isn't it more natural to assume that position measurements are also performed by entangling the system with a classical pointer object (for instance, the screen and the particles become entangled in a double-slit experiment)? For example, weak measurements are performed similarly, by entangling the system with a Gaussian pointer distribution with a high spread. Therefore, position measurement also perturbs particles and therefore cannot reveal the exact position values. A paper by N. Gisin supports this claim, that position measurements in Bohmian mechanics do not reveal exact positions: https://doi.org/10.3390/e20020105.
