An image has to be much worse than that to fail to save you 6 seconds.
That said, this is their own chosen example of what it can do, so I'd have to assume it is much worse than that on average.
And again, if I can't use it because it's totally wrong, then... what are we even doing here?
It will probably save a lot more, but the point is 6 seconds is the threshold at which 2 cents is "worth it".
Good art takes a long time to create.
If this image were representative, errors and all, it would be where you could expect a professional to reach after an hour or so, give or take — I've seen professionals working on an icon set for multiple days, and most webcomics I see, even when it's their full time job and they've got a good system going to make their output easy for themselves, don't tend to do produce outputs like this should have been more than once per day.
> And again, if I can't use it because it's totally wrong, then... what are we even doing here?
On this, I tend to agree. If you have a specific output in mind, quite often they're just wildly wrong. Repeated generations are just plain bad, and the system just can't seem to get what's being asked for.