Should tags always be indexed or not?

Hi, one question has always been on my mind. Unfortunately, there are many URLs on the webmaster’s account that are in the status section in the coverrage section:Excluded /this number : 10.1K

Most of these addresses are tags. When I check them in my webmaster account, there is no indexing at all. On the other hand, there are no settings to prevent indexing. Is this important? Should tags always be indexed or not?