[nytgop77]

For me "measurement" implies known precision, and some straight-forwardness, simplicity and clear repeatability.

Estimation is on the other hand uses measurements as input and has no clear cut path forward. (you must assume some model)

"Chemistry is just applied physics" ("measurement is just estimating via proxy") might be technically correct, but distinction is still very real and usefull.

[kqr]

Ah, we get into the old philosophical "what is probability" question.

I'd argue probability is subjective and estimation is mostly unambiguous, therefore the estimation uncertainty is mostly known, thus estimation is a form of measurement.

I can absolutely see how, if you think probability is frequentist/objective or you think there's generally non-uncertain ambiguity in the estimation task, you would disagree.