I usually like to start new worlds after I feel that my current one is "outdated." Typically, I run into the problem of having an influx of copper plates over iron. Since most items use more iron plates than copper, you can quickly start a large build up of copper plates unless you purpose...

There are smart inserters and smart chests but what about smart spiltters ! What if you had a transporter belt with multiple items on it and you had no room for smart inserters and only a transporter belt with a splitter but when you tried the splitter it split all of your items but you only wanted ...