Is that level of precision “overkill”? It depends on the part and on its application. E.g., the canards that Lockheed Martin and LQMT once worked on had very tight 3 dimensional requirements, part to part. IIRC, L-M required that parts not vary by more than .005” and LQMT was able to hold those to .0005”. (I don't recall the exact numbers but I know LQMT exceeded the L-M specs by ten fold. As far as I know, that level of precision is not available from MIM, but only from CNC and IM. (There was a PR to that effect but it was prior to 2015 and is no longer on the LQMT website.)
Pacemaker cases - on the outside - do not require such high precision, but I don't know what the requirements are for sizes of the internal compartments. Joint prosthetics do not require that level of precision either. However, there are many hundreds of medical devices whose internal parts might require extremely tight tolerances with very little variation in size, part to to part.
Do you know what the tolerances are for the foldable screen parts? I'd imagine they require high precision and very tight tolerances, but that's way outside of my area of expertise.
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