What's the big hang up about the bolt not being locked while the safety is on?
Some guys don't want a chance of the bolt opening while they're hiking or stalking thru the woods so they prefer the safty to lock the bolt down.
I prefer for the bolt to unlock with the safety on for unloading. Bingo!
And in a Model 70 you can do BOTH, merely by selecting the middle position on the safety. With a non-locking bolt safety, the bolt can be easily snagged whilst hunting and have the round drop out. The bolt used to lock on 700s but as a CHEAPER version, they eliminated that.