I think that skyboxes are good and necessary to create a good dimension. Twilight Forest has a skybox with stars, Betweenlands has like a crack on the sky etc.
I will definitely. use this. If I were a developer, probably I will add this like an optional setting for the modder. For example, if you want to add a skybox to your dimension, add it, but if you don't want to add any skybox to your dimension, simply disable the option :D
(Extra idea: Another idea is an option to add clouds like Minecraft ones in custom dimensions) 8)
This ticket is a duplicate of: https://mcreator.net/tracker/issue/47600
Don't open duplicates as they are our TOS violation.