It's the Achilles Heel of the home run system...
With a trunk and branch system you can have a recirculation loop from the furthest point(s) on the line or from the remote manifold so hot water is right at every fixture quickly....
I like the picture you show...
It may look pretty right at the manifold but a few short feet away all that prettiness turns into a bundle of spagetti with 20 tubes in it.
Now take those 20 tubes and hide them in a wall and imagine the increased chances of the PEX catching a drywall screw or even a nail when you hang a picture...
BTW that picture is a hydronic heating system and is not a potable water system.
Your profile location says Chicago, I would check your local plumbing code to see if PEX is an approved material in your application.
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