I assure you, it’s not my imagination. When I got a new shower head, and the water trickled out of it, I took it off, and drilled out the hole, and got a greater flow of water.
All the older shower heads in my buildings have great water flow. All the newer ones, mere trickles.
I never said anything about imagination, when a customer complains that their shower head doesn’t work well, I put in one that does.
Shower heads vary greatly in quality.