I forgot to mention that the cheat menu is already deactivated. Regardless of whether or not that is enabled in that startup screen, you can still open the console and type "cm" and the creative menu will be available.
Here's another example to illustrate: Say you're working on a base and you've made some wooden frames. Now you want to upgrade those frames, one way is to have enough wood for the two wood upgrades then have enough cobblestone to upgrade further then have some concrete to upgrade even further. Then you wait for the concrete to dry and then apply another layer of concrete and wait for it to dry, then you'll need enough forged steel to upgrade to steel. Or just press F1 then type "cm" then enter the creative menu then grab some steel blocks. And while I'm in the menu I might as well grab myself a level 6 steel pickaxe, level 6 steel shovel, level 6 sniper rifle, all the ammo I could need, etc, etc., etc.
So in a sense I would need to have enough will power to not open this menu, which if I'm being honest I don't, so therefore the game becomes almost pointless for me and I love this game. Just wish there was a way to disable it all together to curb any temptation.
It's very true that there isn't much to prevent me from reenabling through the means listed here but as long as it's not as easy and quick to enable.