How to effectively use quick battles (autobattles)?

It's artificial, obvious, and I know it. In reality, something like this would happen with a probability of 99.99%. And even if the AI doesn't use oil, remove stacks, and focus all its forces on one target... it still often suffers comparable losses.

I took examples from author-made maps like "Battle of the Titans," "Fatum," "Beautiful World," and "Summon the Ship." Such scenarios are very possible there, but of course, they won't happen when playing online or on standard maps.

But I agree, in most cases, the losses are large, but still reasonable.