...what? I mean, maybe some theoretical physicists spend all day doing maths and not simulating it, but almost all the physicists I know spend large amounts of

...what? I mean, maybe some theoretical physicists spend all day doing maths and not simulating it, but almost all the physicists I know spend large amounts of time writing software; anything experimental or observational tends to produce large volumes of data with extremely bespoke analysis, and anything non-experimental probably involves lots of simulations. People usually have a shock when they start their PhD and find they have to learn to program, fast.