I can't see the need for a stick and markers to gauge my cuts.
Agreed! Unless you are feeding several different size stoves, it doesn't take long to "know" where to make the cut.
Of course, you may be one of those perfectionists, who want a woodpile that looks like the ones in the ads- too nice to use, to burn
Guilty!

But it is more a practical matter for me. I have two 8' x 8' x 8 to 10' high bins in my shed (photos attached) that I need to completely fill. I heat with a wood furnace that uses about 4 chords (= 1 bin) per year. As long as I fill the empty bin by fall I always burn wood that is at least one year old.
If I don't keep a consistent 16" length and size the wood pile is unstable.
I used to use the "saw bar" method for measuring and still do occasionally. But I gave it up for a few reasons:
1. it isn't as consistent (more correctly, I'm not consistent

)
2. it adds some risk--I've had a couple of close calls where I knicked my pants or came close to my dog (who had just deposited a ball for me to throw) as I turned the saw parallel with the log. That's why I made the previous comment about concentrating, especially when finishing a cut.
3. the measuring stick marking gives me an excuse to rest and requires less effort and stress than constantly turning the saw.
These factors get more noticeable when you're 68+.
Another adjustment I made the last few years is I never take extra gas. I fill the saw, and when it's done, so am I. It keeps it enjoyable and helps me move better the next day.
I normally cut alone but sometimes cut with a neighbour who is 15 years younger, but his back is worse than mine. Then we take two full saws and quit when they're done. We rest and talk while we mark the next log and drink lots of water (beer comes later). And often sit on the logs and solve the world's problems. Woodcutting is one of the most enjoyable things one can do.
Another suggestion: the plastic bags in the second photo are full of birch bark which is great fire starter. If you're cutting birch, score the bark by running the saw the whole length. The bark will peel itself.