@Revachah has already given a detailed explanation of some of the different features in Africa which explains why trying to map outside patterns onto it don't work.
The only thing I'd add to that is that simplistic models of progression don't really work anywhere. There isn't a neat model whereby a people are "hunter-gatherers" (a very generalised term at best) who get their food exclusively from hunting and gathering, then become "farmers" who get their food exclusively from domesticated crops and domesticated animals. It's better to think in terms of different methods which different peoples use to manage the land; there's almost always been an amount of overlap and different strategies rather than a single model.
For instance, even within medieval Europe - which had a long tradition of agriculture - reliance on wild gathering (berries etc) still formed a significant part of the diet. Pigs didn't fit entirely into the domesticated or wild category since they were often left to run semi-wild, mostly feeding themselves, perhaps with some food scraps, and then might be killed for food when convenient. Forests could be managed for food (gathering, hunting), coppicing trees to cut down repeatedly for chacoal, and so forth. Even today, hunting supplements the diet in plenty of societies which are predominantly agricultural (such as the southern USA, and in Australia where wild-hunted kangaroo can be found on supermarket shelves).
We don't know all of the details of how agriculture - however defined - emerged in Mesopotamia and spread into Europe, but even what little we can glean from archaeology makes it clear that it wasn't some linear process. For example, crops spread into what is now southern Sweden, then were abandoned for over a thousand years as the inhabitants switched to other methods of obtaining food, then crops reappeared again. When I covered this in LoRaG, I had a variety of different land management strategies emerge and develop, such as managed aquaculture, designated rangelands dedicated to hunting rather than crop-raising, and so forth.
So when discussing how things might change in Africa or elsewhere, look for patterns of land management and different strategies and how they might change, not just for agriculture as a single system.
The only thing I'd add to that is that simplistic models of progression don't really work anywhere. There isn't a neat model whereby a people are "hunter-gatherers" (a very generalised term at best) who get their food exclusively from hunting and gathering, then become "farmers" who get their food exclusively from domesticated crops and domesticated animals. It's better to think in terms of different methods which different peoples use to manage the land; there's almost always been an amount of overlap and different strategies rather than a single model.
For instance, even within medieval Europe - which had a long tradition of agriculture - reliance on wild gathering (berries etc) still formed a significant part of the diet. Pigs didn't fit entirely into the domesticated or wild category since they were often left to run semi-wild, mostly feeding themselves, perhaps with some food scraps, and then might be killed for food when convenient. Forests could be managed for food (gathering, hunting), coppicing trees to cut down repeatedly for chacoal, and so forth. Even today, hunting supplements the diet in plenty of societies which are predominantly agricultural (such as the southern USA, and in Australia where wild-hunted kangaroo can be found on supermarket shelves).
We don't know all of the details of how agriculture - however defined - emerged in Mesopotamia and spread into Europe, but even what little we can glean from archaeology makes it clear that it wasn't some linear process. For example, crops spread into what is now southern Sweden, then were abandoned for over a thousand years as the inhabitants switched to other methods of obtaining food, then crops reappeared again. When I covered this in LoRaG, I had a variety of different land management strategies emerge and develop, such as managed aquaculture, designated rangelands dedicated to hunting rather than crop-raising, and so forth.
So when discussing how things might change in Africa or elsewhere, look for patterns of land management and different strategies and how they might change, not just for agriculture as a single system.