Mods allow infinite amount of stuff the game doesnt allow, if you think the circuit creator mod adds something already in vanilla/adds nothing useful then why did i use it? there must be a reason right?
well the reason is that it adds another logic gate that is literally instant, making a cpu in vanilla SM will max at like 5 or 10 hz MAX, i wanted to go for the maximum possible with or without mods.
and i found that the circuit creator mod adds the instant gate that eventually i built this 40hz cpu with, without the circuit creator mod this build is IMPOSSIBLE to do in vanilla and be even half as fast.

soon i'll use another mod to build an even faster processor.

so in summery mods are a big part of the game and the devs even know it, thats why they have mod support for creative and will add it to survival soon, so if you dont like mods i hope you give them a try.
:D