Not disagreeing with you, just saying the finger prick has a lot going for it. In particular the lower skill barrier to do it may make it cheaper or more convenient.
It certainly opens the possibility of self administration up a lot more than a needle.
The problem with self-administration though is misinterpretation. Not to mention that the logic of cheapness/convenience -> more data -> better health doesn't always hold. The more features you screen for the higher the chance of false positives, and most people don't know how to put correct readings into medical context.
It certainly opens the possibility of self administration up a lot more than a needle.
Bit of a moot point until it comes along, though.