Local buyers search for a specific service in a specific place: 'emergency plumber in Arlington', 'teeth whitening near me', 'roof inspection Fairfax'. If your website has one general services page, Google has little reason to show you for those searches, and buyers who land on it can't quickly tell whether you do what they need.
Focused landing pages fix both problems. Each one covers a single service or area in real detail and makes the next step obvious.