> I'm using FTP/FTP-SSL because it's the easiest and most common for the end user.
That's quite a bit different than your original argument (which was the self-contradictory argument that FTP is the only standard for file transfer, and that WebDAV is the only other standard for file transfer.)
> It's still the most common and easiest to set up for a novice user.
I don't think there are many "novice users" that can setup an FTP server that would fall down at setting up an SFTP server.
> FileZilla Server does not support SFTP.
There are plenty of open-source SFTP servers for windows and that support linux (not necessarily the same server for both windows and linux, but see the next point.)
> So it needs to be simple and free: FileZilla Server backend (runs on Windows or Linux)
> HTTP-1.0 was a mess. POP3 was a mess. All these protocols were insecure and evolved because software makers put up with their madness and made great software.
Right, and once HTTP/1.1 and IMAP were widely available and well supported with F/OSS servers and clients for most platforms, it wouldn't make a lot of sense to tie a new product to HTTP/1.0 or POP3.
There's a difference with putting up with a protocol that is suboptimal but the best available for the role that has widespread support and, on the other hand, doing so when alternatives that address its problems have been well established.
That's quite a bit different than your original argument (which was the self-contradictory argument that FTP is the only standard for file transfer, and that WebDAV is the only other standard for file transfer.)
> It's still the most common and easiest to set up for a novice user.
I don't think there are many "novice users" that can setup an FTP server that would fall down at setting up an SFTP server.
> FileZilla Server does not support SFTP.
There are plenty of open-source SFTP servers for windows and that support linux (not necessarily the same server for both windows and linux, but see the next point.)
> So it needs to be simple and free: FileZilla Server backend (runs on Windows or Linux)
According to https://filezilla-project.org/ FileZilla Server is Windows-only.
> HTTP-1.0 was a mess. POP3 was a mess. All these protocols were insecure and evolved because software makers put up with their madness and made great software.
Right, and once HTTP/1.1 and IMAP were widely available and well supported with F/OSS servers and clients for most platforms, it wouldn't make a lot of sense to tie a new product to HTTP/1.0 or POP3.
There's a difference with putting up with a protocol that is suboptimal but the best available for the role that has widespread support and, on the other hand, doing so when alternatives that address its problems have been well established.