when i've got a handful of plants that i am personally interested in, sure, that make plenty of sense. but for those whose collection consists of hundreds to thousands of plants, those tags sure come in handy. no database can account for that---flux of trades out and in, receiving new plants, crossing plants, lose a tag, and you can potentially lose a valuable plant.
-take for example someone who grows 15-16 different clones of moorei, and also happens to have an 'adrian slack', and a friend comes over, takes a look at the slack and puts it next along with the other moorei clones, and there are no tags....that is a sad story.