The problem is, so many "soft skills" are things you can claim to have—and maybe even think you have—but can't actually be meaningfully tested in an interview setting.
Things like leadership, creativity, collaboration, ability (and drive) to learn new things quickly.
Basically the only ones you have a chance at demonstrating in an interview are communication (within limited parameters) and problem-solving (assuming the hiring team knows how to put together a problem that's well-calibrated for the type of candidate they actually want). And even those can easily be thrown off by the extremely high pressure of an interview.
Things like leadership, creativity, collaboration, ability (and drive) to learn new things quickly.
Basically the only ones you have a chance at demonstrating in an interview are communication (within limited parameters) and problem-solving (assuming the hiring team knows how to put together a problem that's well-calibrated for the type of candidate they actually want). And even those can easily be thrown off by the extremely high pressure of an interview.