This flag is proven to be very useful!
Especially if you want to reduce error rate per hour.
I don't know if it always works though.
There are times when using this flag caused rclone to do nothing for few hours at the start time, no logs at all even with using -vv flag. But after few hours it starts normally by itself.
In my case, before I use this flag whenever I uploaded more than 750GB limit of either server-side or non-server-side, I always get 403 errors due to each Google account is heavily being used. So for example near uploading 700GB, I always have constant error 403 userratelimit exceeded for almost all day for constant 20% of total all requests. Uploading speed is throttled at this time (by Google?). Then around uploading 740GB the 403 userratelimit exceeded error rate jumps to 100% before the process is killed or stayed like that until 750GB limit is reset.
So in the dashboard for each of Google account, the graph is always full of 403 error because I use up 750gb limit just within few hours every day. The pattern of the 403 error is also the same, 20% error rate for almost all day long, spiked into 100% error before being reset.
By using this flag, it looks like that once it reaches 750gb and receive error, it becomes fatal error and kill the process. So this minimizes the number of 403 error rate I have been receiving. This result in much cleaner DRIVE API dashboard. No more 403 error all day long!
I wish this is turned On by default setting.
Together with --tpslimit flag, this results in so much reduction of total 403 and 5xx error. UI