It’s probably one of the most enjoyable feature from some AdBlockers : blocking specific content or area of a page.
I did that a lot with YouTube comments… Faster page load and, well, let’s say it helps keeping faith in humanity ^^
More seriously, if you keep the balance between a functional browser while getting rid of ads, you still get some annoyance : cookie consent, subscribtion offers, chatbot trying to sell crap, etc… 
UBlock Origin provide a function to block targeted content wich works pretty fine even on Firefox mobile.
Having the same integrated with Brave (desktop and mobile) would be fracking super awesome !
Here is some screenshot to illustrate :
With Brave (standard blocking)
With Firefox + UBlock Origin add-on
(“Element Picker” mode)
Even selecting what you want to block is a very satisfying moment. ASMR guaranteed 
Unless there is some secret plans to be able to install Chrome add-ons on Brave mobile, this feature would be a huge shield enhancement 