agreed. I definitely prefer flat white paint. It holds up and is easy to clean/disinfect.
I built my fair share of rooms out of black & white poly (before grow tents were a thing). It’s great for a quick, cheap room but it doesn’t hold up longer term IME.
The poly plastic becomes very brittle over time and starts to easily rip. Maybe it holds up better under LED’s though. I was always using MH and HPS back then (more UV).