Tags vs Dataview

I am delighted how I can use inline items such as Keywords:: or Author:: followed by lists of attributes, and then have Dataview produce lists based on any one of the attributes. I used to use tags for such things in Evernote in the past.

In addition I link everything with Wikilinks.

Is there any point in using tags then, for anything?

While I’m slowly learning Dataview without much coding skill I can do a lot. But how do I use Keywords:: etc in the search in the Graph view? So maybe that is where tags would help?

I could just hashes in front of all the words in the Dataview items?

Your thoughts welcome.