@QuietMisdreavus

side note

In the US, if you have an "FDA approved" product, then you will be reluctant to change how you manufacture and QC that product

So if you initially QCed the product with an instrument, then 15 years later you would like to use the same instrument and I think it is true that several instrument vendors would build antiquated old equipment to sell to customers who needed this equipment to do the FDA required QC, cause that was cheaper then doing validation that a new instrument was the same