Not sure I agree with that justification. The player can be smart and nimble enough to take advantage of shorter Graze status effect windows, effectively rendering them the same as Hits, but enemy AIs usually aren't. In general, it definitely feels different to me when I get hit with a disabling status effect for only 5 seconds vs 20 seconds.
There might be specific cases where what you're saying is true, like if you're surrounded by enemies who keep Grazing you with disabling effects (think Xaurip Skirmishers). Even so, the shorter graze duration does allow you to escape more easily if you bring in reinforcements to help out.