I'm a bit surprised to hear it put this way. Aren't physics students usually welcome in finance as quants?
(2) Quant hiring is super-competitive. most physics students wouldn't get jobs. A lot of quants are physicists, but the converse isn't true.
(3) And students? Not so much. Quants like to hire Ph.Ds or possibly ABDs.
Ones who are ALSO good programmers can go the CS route, but most aren't. You need to do basic programming to do physics, but not industry-grade software engineering.
Most don't want to do the work (not implying laziness -- it's about interest / fit / etc.).