OK, so I already know the answer. I am very familiar with Windows Server 2016 Essentials. But, Windows Server Essentials is a step over my head.
I know that 2016 is basically EOL early in 2022, but Microsoft is supporting it with security patches until 2027. But, you won't get updates and bug fixes or that is what I am reading.
Would it be stupid to do this or if I feel more comfortable getting a few more years out of my server with a setup I want?
Most windows operating systems are not that different from their previous versions that it is a struggle to update your skillset.
Also keep in mind that technically to deploy an older OS you still have to buy the new version and software assurance (as that gives you the rights to downgrade) so that you can downgrade to the previous version since you cannot buy 2016 anymore (if you already have the license then that isn't a concern)
Security patches as you and kevinhsieh already pointed out is the biggest concern. They will still release security patches for Server 2016 until 2027-01-11 through extended support. (just mainstream support ends in 2022).
So as long as your sure it will not be in service past 2027 it probably doesn't matter either way.