What's the rationale behind this placement of the pressure gauge? I recently got an E61 single-boiler machine (ECM Classika PID) and am trying to understand how it all works.

I haven't been able to deduce any reason for how/where the pressure gauge is connected. It's at the end of a long, coiled capillary tube that connects just downstream of the pump:



Is there any particular reason for the pressure gauge to be connected here, as opposed to e.g. downstream of the boiler?
It's likely connected there to ensure only cold water goes to the gauge.
Over time, hot water would negatively affect the gauge and, in a capillary tube, more rapidly deposit minerals and clog.