Yes, that’s a fair point. Though, there are other materials that might be explored (types of metal perhaps?) for those that would prefer a non-plastic version.

The reason some might be concerned is that when “food-grade” plastics, like the polypropylene used by aeropress, are used and “exposed to hot water, they release trillions of nanoparticles per liter into the water.”

The slight pressurization and the friction of the rubber plunger likely amplifies that result.