@lalitk There are very well exposed Brands producing products that are totally dependent on the quality of mechanical interfaces, that produce very tight tolerances using materials at Mechanical Interfaces that are not optimised as a material to be used at such a selected dimension as the one selected for the interface.
There are Brands that do similar to the above and select a larger dimension at the interface, as this is dimension that is allowing interface materials to be optimised between each other.
When creating interfaces where very low Micron Dimensions for the spacings between interface parts are being selected, the need for stability of materials in all operational environments is critical.
If one is selecting very low microns (3 Microns as a Spacing Dimension) and paying the premium for this machining. The design is expected to be maintained as with a consistency for being friction free. Incorrect Materials used at an interface will quickly prevent the consistency of friction free from being present.
My experiences of subjective evaluation of very tight tolerance designs that are using parts very stable and parts that are not stable, leaves me with the assessment friction being present has a impact on the End Sound that can be discernible. As a basic description, there is a perception that there is a control present that is limiting to End Sound that can be produced. Where as Friction Free, gives the perception that obstacles have got out of the way and a freedom is discernible.
The Latter is always my preferred experience and the one I like to have maintained.
This is the side interest in my analogue source world, the learning about the Values to be had from the mechanics selected for moving parts belonging to the source for the overall function.