Is this a fact or a personnel opinion?
From two sources. My own experience with loading tens of thousands of rounds in .44 mag.
And, a letter I still have, from NRA Dope Bag on this subject.
Some will argue that in extreme cold like Alaska in winter, the mag primers are more reliable. I don't know, no experience there.
Regular primers help keep the pressures under control and the round will still go bang.
No need. But those who think bigger is always better will still do their own thing.