Some companies do. At my previous company (I have since retired), I would get yearly outsized stock grants to motivate me to stay. I sincerely doubt I could have found matching compensation at another company.

I never had any expectation of loyalty from the company and it didn't from me either, otherwise the stock grants would be unnecessary. I had some loyalty to my manager and had promised him to give a heads up before leaving the company. He knew I would retire once I hit my target.