Did switching to a platform bed frame change my sleep or just expose my mattress?

Nothing else changed, Same mattress. Same bedding. Same routine.

But the bed feels different now. Less movement. Less noise. Fewer micro-adjustments at night.

Now I can’t tell if the platform bed frame improved my sleep…Or if it just stopped my mattress from shifting and hiding its flaws.

Anyone else feel like changing the frame changes how your mattress behaves?