An exoskeleton exists today, in many forms, for example: https://www.festool.com/campaigns/microsites/exoactive
Sort of strange comment given that there are a large number of companies pursuing commercial exoskeletons literally right now.
SuitX
hypershell
Herowear
DNSYS
Moveo
Hell, even big companies like Hilti
I can buy a ton of different models of exoskeletons for anywhere from low hundreds to low thousands online right now...