Hi
The correct advise here is "license you switches as soon as you can". If you run in some critical problem and had to engage cisco TAC you can end up in a situation if they bring this as a possible problem.
But, the switches manegeability will not stop if that is your concern. Few months ago I was working for a very large company and we had some problem licensing our switches. We were not allowed to permit the switch to access the internet so we had to use on promise server to allow the licensing. It turns out that we took a lot to get this server working and the switch licensing was already expired. Nothing changed in the switches manegeability from DNAC despite the eval expired. And we was using Fabric.
