While I agree that ornamental fences/borders would be a good idea in many places in City parks, they are not universally necessary from a design perspective.
Industry professionals and Cormier is certainly one, and one of the best, know this.
You take each design element on its own and consider whether people are likely to beat a desire line, cut a corner, or yes whether dogs may be an issue.
You address these things in a host of ways:
1) Putting in hard pathways where necessary/desired
2) Putting in a dog relief area and/or DOLA
3) Irrigation/drainage
4) Plant selection and placement
5) Topographical adjustment (making the ground go up into a hill or down into a swale to discourage or encourage use)
6) Fences (full or ornamental)
7) Seat walls/benches
You can see evidence from
@drum118 's post above about the thought that's gone into things here. How the furniture is being managed, how skateboarding is being discouraged, how certain things are fixed in place and spare materials have been provided. Let's give Cormier's design a chance before assuming he's made some terrible mistake.
So far, I've only seen one mistake of this type from him, and that's in Berczy, where the grass around the sculpture has been pulverized. That needed hardscape around it; or people needed to be cut off from it.
But he's usually really good about that sort of thing. He knows what ornamental fences are, and he uses them as appropriate in his projects.
FWIW, to the extent I have any concerns here over that sort of thing, I'm probably more concerned about the grass than the planting beds; but I'll wait to see how people behave in the space before judging.