This concept serves as an attribute for other concepts, similarly to how Morphologic abnormalities and Body structures serve as attributes for Clinical finding or Oricedure concepts. We can’t make it Measurement, because it itself does not represent the procedure of taking or monitoring the patient
It’s not SNOMED’s problem, it’s more about how we construct our own SNOMED vocabulary from 3 different SNOMED editions.
We update our sources in January and June, when SNOMED International updates. However, SNOMED US and SNOMED UK are updated later and are based on the most recent international version, which means that concepts from US and UK edition may retain active links to concepts that international edition deprecated. These are not updated until April/October, respectively, when US and UK edition update again.
Me and Dmytry @Dymshyts have recently discovered and discussed this. Most simple solution is to update SNOMED only after all sources have been updated to most recent version. It still means we release SNOMED twice a year, but shift release cycle 3 months forward once.