Size, OLED, HDR, and eARC are three things I can't find in a monitor. I don't know of any 55" OLED monitors that support Dolby Vision and can output their audio to my home audio system over eARC. OLED and Dolby Vision are important to me because HDR makes such a huge difference in properly mastered content. eARC is important because my audio system is able to take advantage of Dolby Atmos metadata and I don't want to lose that. I could just pass my HDMI inputs through my receiver, but my receiver doesn't support passing through 4k 120Hz which I appreciate using with my Xbox.

HDR and OLED are available in some monitor models, but to my knowledge there aren't any 55" monitors with HDR and OLED, and especially eARC.