[stordoff]

Because many workers won't have an option - if companies aren't forced to offer so many days holiday time, they just won't offer it. If you try to negotiate for it, you won't get the job (from an employer's point of view, most workers are, by necessity, interchangeable to at least some degree).

Sure, people with a long track record or specific skills may have more room to negotiate, but for entry-level and/or unskilled work you'd be unlikely to get more than the minimum enforced by law.