There are probably monitors that support RGB or Component, but why bother? XB1 and PS4 give you HDMI cables when you buy the system.
Unless I am misunderstanding your question/point...?
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No, you understood correctly. It's just I have never used a monitor for gaming for Xbox One or PS4. My computer doesn't have an HDMI port though, so wasn't sure if that was a must have, I wanted to give it a try.
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You can bypass the computer altogether and hook the monitor up directly to your console. I assume you know this, but around here you can't always assume.