How do we know? Is this voodoo or something?

mbaird said

I think You could use your old shaft if it was a ”pinned” style . Punch the pin out and press the old gear off of the shaft .

Good point about why don’t more cam manufacturers make them .

You could have gone with a hydraulic roller. Most don’t require a bronze gear .

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Yeah, just venting I suppose.
From what I've read so far is that the bronze shafts are more or less a wear part, designed to be replaced every 1500 miles or so. (Which is not a reality for a street vehicle) Mainly for racing and off road etc. So the only alternative is this so called melonized gear that will work for long term street use.
I think the bigger question is why do street use aftermarket cams need to be billet? Same thing with building a street motor and using a regular volume oil pump. The HV pump is not needed for street use. A billet cam is not needed for a street engine.

PS almost all new roller cams are billet!