Browsers are just small part of the Internet , we already use lot of internet outside the browser in the form of apps , email etc .

Some people know and can use chose their DNS , many have to rely whatever dns their ISP or corporate IT provides . Very hard to move all that to common new standard

Browsers esp chrome/safari as it is modify the URL way more than I am comfortable with .

As bad as ICANN is I really don’t want Apple and google dictating how dns should run