Roblox image resolution

I wondered why by uploading an image in ImageLabel or the like, the quality and resolution of the image is lowered so much even though the uploaded images have a resolution up to 4k. Then I found out that roblox supports a maximum resolution of 1024x1024 pixels, but is there a reason why the resolution is not increased? For example to 1920x1080 so as to have more detailed images?
Thank you🙂

I think this might be a limitation of moderation or asset size.