It doesn't mean that IF i get the question, i can say "just look at the log".
It means that i have gotten questions like that and similar before (think "keep a regular logbook of what you're working on") in other jobs; and have never gotten anything like that on Upwork.
You might argue my clients are simply different, and it's possible, but i think i simply don't get things like that because they feel comfortable enough with my work and are mollified by the logs if they have worries.
A screenshot taken every 10 minutes in no way proves you aren't slacking off. Your assertion that it protects you like this is specious.