Are you aware that there are multiple themes, and you can also use your own client of choice to connect to the server and display the data anyway that you like?

You can also use another instance that has different defaults if you prefer to access the same data.

I honestly don’t know what you mean by any of these. What do you mean by “tabs”? What “tags” do usernames have on them? What do you mean by “the downvotes have disappeared?”