So what ? It gives me optimum performance Desktop and Mobile.

On my Mac its upto 2 times faster and in my android phone it's upto 4 times faster.

Using Brave will provide no benefit regarding the extension changes you are mentioning, unless Brave forks and stays on an older version of Chromium. Where are you seeing speed enhancements? When it comes to loading pages, or in task manager?

Yes. Page loading is faster in Brave

It's even more faster in case if site is full of ads and internet connection is slow.