I find it a useful technique to know how to do. Like you, I've found that anything larger than about forearm/calf (depending on your body type

) sized wood is just not worth the effort to baton (even with a large knife), many times I'm only going after stuff wrist sized (I'm lazy). I have also found that you don't need to baton tons of pieces. Its just for lighting a fire, you baton one, maybe two forearm sized pieces and you've got your core kindling done, and don't "need" to split any more wood. And finally, the grain of the wood makes a big difference. I only try the straight grained ones anymore because again... I'm lazy.
And I only baton certain types of knives (ones built with that in mind). Additionally... when you have done it a bit, you can tell when the wood is just not cooperating. When that happens, I just try a different piece. In the past, I've tried to test the limits of my skills/knives, but in the end its just not worth the effort.
I personally have had more success battoning hatchets than I have with swinging them. I guess I've just got bad aim? Once the pieces are smaller I do the lay it on its side trick shown in a few of the videos above. But personally I'm not a fan of most hatchets. I find that most larger knives can do similar tasks, and are more useful in other ways (to me, in my area, etc). I feel like "axe like objects" get much more useful as they get larger, and they earn their keep as a specialized wood processing tool once they are past ~20-22in or so in length.
Anyway, its a hot topic, and one you'll get lots of differing opinions. So these are just my two cents.
Cheers

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EDIT: +1 On what 42blades said :thumbup:.