Because to most people, computers are just a tool, and their expertise is in other areas you know nothing about. The general public does not know the difference between x86, x86-64, and ARM, nor do I expect them to.
Plus, the OP would not have known whether or not it would have worked prior to testing it out. There was a non-zero probability the software would have worked. I have x64 finite element software (like OPs) running on an ARM Mac via Parallels -> Windows 11 Emulation. In theory it works, but with so many layers, it's slower than running natively on an Intel machine.