Because, based on what I could find, the embrightened and inovelli switches have the ability to be flashed, and they are also in wall dimmer switches. From what I've been able to find on AliExpress, they are either not for US style electrical boxes, or they are only switches.
The lights I'm trying to fit these dimmers on are not smart lights. One is a dimmable 3'x18" LED panel light, and the other is a dimmable canless recessed light. I have no attic access, and I would like to not have to pry these lights out of my ceiling unless absolutely necessary. So I'm stuck with whatever I can shove into my electrical boxes in my walls.
The plan is to slowly retrofit the entire house with regular Zigbee switches at some point, but these two have to be dimmable so I can set the brightness at night as hallway lights so they don't blind my family.
If I have to, I'll look into getting normal Zigbee switches and adding a dimmer module behind it, but like I said before, I don't have a lot of room behind my switches in the boxes for things.