They are often not required. It's obviously great if you have worked with a lot of the technology used at the new company, but many companies don't apply these as hard filters. I've never seen a candidate that had a 100% technology fit, but not one cares about that.

I view the technologies listed in the job ad much more as information for the applicant to judge if they'd be comfortable working with such a tech stack. Often it's the only place to get a glimpse of what technology a company is using.