I just wanted to list some features here currently keeping me from using the Brave browser.
Devtools don’t dock in window - This is really troublesome for someone that works as a UI developer. Having them in separate windows seems like a very small issue, but when it comes to productivity switching between the windows is too much of an issue.
Can’t use chromestore applications easily - This one has been discussed a lot on Github and is being worked on afaik, so I won’t elaborate here.
1Password isn’t contextual - As it says, I can’t right-click on a page and autofill it with a detected password, Brave actually opens the website in a new tab and fills it.