> Isn't the point of a memory safe language to allow programmers to be sloppy without repercussions, i.e., to not think about managing memory and even to not understand how memory works

No. The point is even the best programmers of unsafe languages regularly introduce both simple and subtle bugs into codebases while being careful about handling memory correctly, and therefore we should use languages that don't even allow those bugs for most every use case. Using these languages still allows crap programmers to waste GBs of correctly allocated and handled memory, and good programmers to write tight, resouce-sipping code.

Dependencies are orthogonal to this.