This much I can say on that : absent the atlatl (or bow), Man
as Beefeater, other than by occasional scavenging or lucky coincidence, is an idea that finds no corresponding niche in feasibility. IOW, man at the top of the food chain. Which equates with the basic notion of "man" well enough.
This is part and parcel of an overall realisation : such low-tech subsistence strategies as you are envisioning (and imposing on landscapes that render them impossibilities) are feasible only in selected environments. But even with perfect adaption, the tougher the environment, the more highly technological must be the adaption to it if actually surviving and prospering is to be the outcome.
Technology in this sense does not mean elaborate or complicated -- it means simple, ingenious, effective and reliable. As in the Esquimo's multitude of purpose-specific tools. As in survival in northern coastal regions being dependent (in part) on nets and smoking to lay in a years' supply of salmon, shad,
et al. during the spring run.
At every interface of man with potential food, there has to be a technology that enables it to be harvested with maximum reliability and minimum risk to the harvestors. Absent which, absent reliable food. Absent which, absent people.
Modern humans have fared pretty badly in attacks by deer -- even hunters with wounded ones. Up the scale to horse, elk and moose (to say nothing of aurochs, mastodon, mammoth and their ilk), armed with only a pointy stick, and good luck to you. You'll certainly need it.
And even this is assuming you can get to the wounded level with them
on a reliable enough basis to presume survival. Animals learn too.
The atlatl is a far simpler example of technology than even the needle &/or thread from plant fibres. The hypothetical point at which that even that level of technology had yet to appear is a level at which hominid habitation of sub-glacial Europe and America is inconceiveable.
At least to Yr. Obt. Svt.