If there is a safety/danger issue (Not saying that there IS) then it is the proximity of the explosion to the head.
It certainly ISN'T with the supposed "value"(price) of the gun.
Anyway, I'll guess that most reloaders start out with light loads and at least CONSIDER peak chamber pressure.
Using the tables they probably select bushings and don't ream them out (at first).
Sweeping generalization; Hornady/Spolar bushings throw a bit "light".
Also there is a margin of safety in the load tables anyway.
See where I'm going with this ?
Right, these assumptions will lead the beginning reloader toward light soft shooting loads.
Experimenting beyond the tables... well, that is up to the individual.
For me SAFETY matters more than a few extra FPS, fractions of an ounce of lead or grains of powder.
Oh yeah, I've seen trap shot with 1/2 oz loads out of a 410 - if you're ON IT you get it.
All too often I don't, but that isn't because of my home made ammo.