Developer loses its charge over time. You have to replace it.
Every laser copier/printer still uses developer. If you can show me a model of laser printer that does not, I'm all ears.
There is also a transfer roller in each copier, maybe that's what you're talking about?
I could be mistaken, but as recently as 2020, every commercial copier I worked on, still uses developer. I have never worked on, or heard of a laser copier without developer.
Every laser copier/printer still uses developer. If you can show me a model of laser printer that does not, I'm all ears.
There is also a transfer roller in each copier, maybe that's what you're talking about?
I could be mistaken, but as recently as 2020, every commercial copier I worked on, still uses developer. I have never worked on, or heard of a laser copier without developer.