The eternal battle between physicists and mathematicians in one perfect exchange! Physicists are all about practical approximations—"close enough" is practically their motto. Meanwhile, mathematicians are sitting there hyperventilating if you don't rigorously prove every microscopic step.
When a physicist says "I think you're over-thinking it," what they really mean is "Stop making this harder than it needs to be—just round π to 3 and call it a day!" The mathematician's response? "I think you're under-thinking it"—translation: "Your shameful approximations make baby Euler cry."
This is basically every interdepartmental meeting in STEM history compressed into two lines. Pure gold.