As a reminder, Brave was created by the guy who brought you JavaScript and was later fired from Mozilla for donating to hate groups. Brave also profits from multiple forms of fraud including NFTs and affiliate hijacking.
If folk want to have a chromium-based browser made by a company, take a look at Vivaldi instead (which will keep the old plugin architecture, so adblockers work). It has a limited built-in blocker and extra features, but for now still runs uBlock.
Vivaldi is what I use, and it's absolutely the best Chromium browser I've ever tried.
That said, I'd switch to Firefox in a heartbeat if it could duplicate that sidebar. I use that thing all the time, and it's the only thing keeping me on Chromium.
As A Vivaldi user since day one, I gave it up once I couldn't take anymore of Googles/Chromium bull hockey. I'm just so done supporting a company like that. Firefox switch wasn't easy, but after the first week I got used to it and I'm never going back to Chromium browser. Anyone can switch if you actually care enough.