Should I let my contractor drill and set rebar dowels in my concrete storm shelter to secure a concrete patio that will be poured around it?
I don't consider it appropriate to hang slabs on foundation walls. First, it doesn't keep the slab up. If the interior of the slab settles the slab will almost certainly crack and sag, creating a saucer with raised edges. Secondly, it threatens the foundation walls with undue stress.
I can see connecting multiple slabs with such dowels, but not foundation walls. My $.02.