As I see it, I want the frequency boundaries on my chart so that when I fly from, say, CN to TEM I can listen out on the appropriate frequency where I can expect to be able to ask for ops info from an appropriate person or if it all goes bad call for help.
It's not that I want a barrage of yap, nor do I want to make one, but I want to know the appropriate frequency rather than take a punt. You never know, somebody might be helped out of a tight spot by being able to call the proper controller.
What then is the downside to having the boundaries on the chart? If you don't like them, ignore them FFS. Stop trying to micromanage Dick.