I came just to say this. I have a Brother MFC-L2700DW that I bought in 2018. I only connect it to the power when I need to scan or to print, which it does flawlessly every single time, over WiFi, and disconnect it again. The toner is the original one that came with the printer.
Stop giving money to the ink parasites.
They're not oblivious, they just don't care because they know there won't be any consequences. And those few who dare to say anything are "antisemite" for not supporting genocide.