Should I accept or return a replacement Dell UP3216Q monitor with four dead pixels?

Seeking advice whether to accept or return a replacement Dell UltraSharp 32 Ultra HD 4K Monitor with PremierColor (UP3216Q monitor) with four dead pixels. This is a relatively expensive 4K monitor - original cost more than US $1100.

My UP3216Q went dead - it stopped recognizing video from the PC on any input port. Dell replaced it under warranty - call this replacement R1. But R1 had either a 2mm hair under the panel or a diagonal string of pixels (I think the hair). So Dell replaced that one with what we will call replacement 2 (R2).

I just received R2 and ran the monitor's diagnostic test to look for problems. I see four dead pixels in four different areas of the screen. I tried a microfiber cloth and some Philips LCD screen cleaning fluid to make sure they are not dust. Under a magnifying glass each is the same size tiny square box. A pixel.

Three questions:

1. Is it reasonable to expect zero dead pixels on a replacement refurbished monitor?
2. Is it likely to get worse or stay the same?
3. Should I accept this? Or return it?

I'd appreciate your advice.

Thanks, Pete