They’re convenient but error-prone. I think everyone who wrote a decent amount of Go had that malformed, misspelled, or misnamed (“db” vs “sql”) tag at some point.

However the core language way of dealing with enums for example is extremely weak. It's common to have a typed enum on a struct. When parsing the struct, random string (or whatever the alias is) values sneak in and the only thing you can do is validate.