Any one that considers the 30-06 useless or junk does not have a firm grasp of reality.
- deer in cover, with the same length barrels, the 30-06 is 1/2" longer than a 308, the 308 works as well as a 30-06, not better.
-deer at long range, with the same bullet weight the 300 Winchester magnum adds 100 yards of range.
-elk in cover, see deer in cover above.
-elk at long range, see deer at long range above.
-big bears, the 30-06 loaded with 200 grain Swift Aframes or 180 grain TSX's is enough gun. There are no minimum calibers proscribed by law for big bears.
-dangerous game, the 30-06 is not a dangerous game cartridge so yes it is not suitable. Niether are the 308 Winchester or the 300 Winchester Magnum. By law in Africa dangerous game cartridges start at the 375 H&H. That does not however mean that the 30-06 can not kill dangerous game.
So much for your ranting. As my father used to say, "stupidity unlimited".