  The hunt for exotic properties in flowing systems is a popular and active
field of study, and has recently gained renewed attention through claims such
as a ``segmented Fermi surface'' in a superconducting system that hosts steady
superflow of screening current driven by an external field. Apart from this
excitement and the promise of hosting Majorana zero modes, claims such as this
imply exotic gap-to-gapless quantum phase transitions merely through boost of
inertial frames of observation, and challenge the very concept behind the
principle of relative motion. Here, we first illustrate an obvious inescapable
physical inconsistency of such claims concerning the flow velocity. Taking into
account this basic principle from the beginning, we then demonstrate that a
proper employment of physical statistics naturally reproduces the experimental
observation without causing such a conceptual crisis. This example showcases
the importance of strict adherence to the basic principle of relative motion in
physical statistics, especially when pushing the frontiers of physics and
technology.
