Another reason we don't have TES6 is that they don't want to split the player base for Elder Scrolls Online. That game will have to run its course before we see a new ES game. Just my opinion
I think its important to update mostly for new features to mods. Many Fallout 4 mods are still WIP. So you don't want to miss out new features or bug fixes for mods.
I could be wrong but I believe Enhanced Blood Textures will do this. Install the standard version with scripts from the manual install options. https://www.nexusmods.com/fallout4/mods/212/?