How do you know this? Because I don't know this, and not aware of such a thing. What H&C application are you referring to? When do you make this application?
More accurate to me would seem to be that entering through the land border _circumvents_ or avoids in most cases the formal H&C determination process (which would usually happen if you applied for a PRTD abroad while out of compliance).
If the point is to circumvent that process, then you should not expect to get any related 'benefits' such as somewhat easier travel. (You can always leave, the issue is whether that puts your PR status at risk upon return)
Or put differently: if you enter via land border _in order to_ avoid H&C determination, you should expect to remain in Canada until in compliance with the residency obligation if you wish to avoid PR risks.