Plywood under concrete front porch (cold room ceiling) - removed

Hello. My house was built in 2007. There's a cold room under the front porch which had 3/4 plywood supported with horizontally running 2x4s on the ceiling (i.e. under the concrete porch floor). There were additional 2x4s along the perimeter to hold up the 2x4s that were supporting the plywood. Those 2x4s running along the perimeter were nailed (yes nails) to the concrete foundation walls in the cold room and the nails weren't hammered all the way in. Some nails were even bent/crooked. My guess is that the plywood was meant to be temporary and only there to support the poured concrete porch floor while it dried. But the builder never removed the wood. I took the liberty of removing it all myself several years ago (I think in 2014 or 2015). So the ceiling of the cold room is now the suspended concrete porch floor without any plywood or 2x4s. Was removing the wood a safe thing to do? Is there any way that the plywood was structural and meant to permanently support the concrete porch floor above it? Thanks.