Yes, Schema markup is crucial since it improves the appearance of your website in search results. It enables rich snippets, which are additional material like photos or videos, to be displayed in the SERPs. Users are more likely to click on results when they see the accurate data they require.
Nobody takes advantage of meta tags on everything let alone worry about it. But the reason it exists is to write snippets that that engines read but as mentioned how much have you already left blank as there is plenty to do in all forms of SEO.