Can you please cite some evidence for this? My understanding is that specialization into trades was an outcome of the agricultural revolution, which happened quite a bit later than 30,000 BC.
Note that this is in agreement with you, that the number of trades open for people to work in was pretty small until fairly recently.
Spear fishing hunter gatherers, for example, are out there but they've moved on to using steel rebar for barb points over stingraytail barbs, wire wrap for binding over chewing just the right branch fibres, and iPhones over smoke signals.
It's similar but not the same: https://www.youtube.com/watch?v=7gmCX7R-W4c
That covers pure traditional hunter-gather | slash and burn agrarian | herding, etc as traditional lifestyles that are still mostly practiced in mostly traditional forms by some parts of communities but also supplemented with tourism, children going to school to learn law and other skills, FiFo mine work, etc.
I had read a bit about Masaai keeping track of each other and their herds with mobile phones. Thank you for reminding me about that.