TL;DR
Add equivalent of logistic/trash slots on sandbox mode. Slots would instantly fullfill its requests (no bots needed).What ?
In sandbox mode there is no simple way (at least in vanilla) to manage your inventory and it just matter of time when it get filled with junk and player needs to dump it somewhere ...Why ?
I dont see the point of inventory in sandbox mode (everyting is free). But auto logistic/trash slots seems easier to implement than special inventory type just for sandbox ...PS: It would suffice to have logistic/trash slots in sandbox, that behave same way as in freemode - almost instant request fullfill is already possible via teleporting logisitc bots from creative mod