As a lead channel for most local services: usually no. Organic reach for business pages is small, and hours spent posting rarely survive a cost-per-lead comparison with search or reviews. As a credibility layer: yes. An active-enough profile reassures the prospect who's already checking you out.
The exceptions are visual and community businesses (food, fitness, renovation, events), where discovery genuinely happens in feeds. There it can be a primary channel, especially with before/after material.
Our default allocation: maintain a minimal credible presence (batch a month of posts in an hour), let reviews and search carry acquisition, and treat paid social as its own measured channel decision, not an extension of posting.