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Words fail to express the sinking feeling that happens when you've typed out a detailed thoughtful response to soneone in a forum reply or a comment on their synth and when you press the 'submit' or 'send' or 'save' button to find that your cookie has expired and your painstaking reply disappears forever, never to be seen by anyone (unless you have been burned so many times that you now make local backups of everything before you send it or 100% of the time use Select All, Cut, and Paste before sending a message).
At that point, you have to choose whether you just need to take a break from the computer or whether it's important enough to try to type it all a second time.
The flip side of this coin is sites like Quora or the Office web apps or the StackExchange sites which happily use server-side autosave whenever I stop typing (or even at punctuated intervals while I am typing) so that even if the browser crashes, or gets closed by someone while I am away from the computer, or Window Update restarts the computer while I am in the middle of digging up the pertinent information to answer a question my reply is safe and waiting for me the next time I sign into the site, even on a different computer.
The relief and pleasant surprise upon finding my words respectfully preserved and ready to complete and send is also difficult to communicate.
Whether it's forum posts or a comment on a synth or a partially edited synth description or highlight description, I'd like to see all of these use this simple autosave functionality.
Ideally every site on the web would use this.