You are concerned that while Brave’s filter list setting suppresses cookie notices it also “blocks the window a user gets when they CLICK ON A LINK TO SPECIFICALLY CHANGE THEIR CONSENT.” Individuals can at any time change the settings that blocks cookie notices and manage any consents they wish to give and any legitimate interests sites may rely on.
I note your comments about the one specific research paper. We have a team of privacy engineers and researchers in Brave who understand in detail the implications of cookie consent or preference management tools. You can find some of their work here https://brave.com/privacy-updates/
If you really do NOT want to suppress cookie notices and to manage consents given to websites you can visit brave://settings/shields and brave://settings/privacy and change applicable settings. We have been asked at various times to block cookie consent dialogues Cookie consent popups - stop the madness
As for GPC, if an individual believes a site is not honouring the GPC setting, then they can file a complaint with the California Attorney General https://oag.ca.gov/contact/consumer-complaint-against-business-or-company
As Brave’s data protection officer, you can always email privacy [at] brave.com if you have concerns about our approach.