Like doing some research for a school project, googling, getting a link to a pdf document on some ftp, clicking the link. Or clicking the download link on some website, and the file is downloaded using ftp.
These things used to be very common, but are less common now.
I think you are overestimating this. I'd include that in my 1/10,000 number.
Access to a feature is a feature. I have not had to change a tire in over a decade, but my unused spare tire in my car's trunk is actually being used every time I drive, by being available.
What about nearly any accessibility feature? What about fire extinguishers? I know that support for the FTP protocol is not nearly as severe, but it is on the same spectrum. For the minority of users that use it the minority of the time, it is good to have it available.
As long as it does not impose significant costs to keep ftp support, they should keep it.
And as it happens, I have had to use FTP several times recently, because there are still active FTP links in some manuscripts and scholarly articles I've read.
But it does. This is explained in the docs. The existing FTP support is bad and updating it to make it secure is a ton of work.
Fire Extinguishers and Spare Tires are safety features. When they are needed, they become absolutely critical. It is also very difficult to predict when they will be needed because they are the result of errors rather than intentional behavior.
In-browser FTP is nothing like that.
Most probably didn't realize that they were using FTP, which is the point of having it integrated into the browser.
Okay. You are one of the 1/10,000,000. What percentage of people have downloaded a driver through any means other than "plugged in device, it said "install driver" and the user clicked it"?
What percentage of the "general population" do you think has ever used FTP. Even once in their entire life. I'd wager it is less than 1/10,000 users. If we look for people who use FTP at least once month, I'd wager it is less than 1/10,000,000. Where are these users that need FTP but would get stranded because they can only install a browser?