How important are metrics to you on resumes?

I've seen resume's with metrics like "increased click rate by 30% after my new design" and idk I kinda roll my eyes because I feel like anyone can pull that info from their ass, what is the prospective employer going to do call and confirm? I would rather save the real estate on my resume to show my design thinking in each place I worked. But I'm not a senior so I could be 100% wrong and this is a dumb opinion please tell me?