About this question
Okay, we know the drill: don't use FTP, use SFTP or FTPS.
But what exactly is the risk being posed? The files themselves are sent unencrypted, and this may be fine, or disastrous, depending on what the code in them contains. But, if we're dealing with static HTML files (or similar), presumably this is fine?
What about a user's credentials, password, etc.? Are these guarded when using vanilla FTP? And if so, is it "adequate"?
I'm asking quite honestly as a quality of life measure. My alternative for updating basic files on a public server would otherwise be with a messy process of SSH keys, etc. using systems which, for the life of them, cannot remember my password when sent via SFTP.
Granted the particular network that one is on is also of importance. A secure office network is a bit different from an airport lounge.