It would be crazy if the candidate had been working for you for 30+ years, but different companies have different standards and different people gain experience at different rates and/or stop learning.

For example, I interviewed one guy to become the Tech Lead for a client's SaaS initiatives. He had a lot of experience, but it was all experience with mainframes. And it showed in how he approached technical/architectural scenarios. Especially for senior/tech leads, you don't want to have to retrain them.