@
Akira
On a serious note (forget my earlier aggressions), every type is needed. We need craftsmen to repair items so we can use them again so that it doesn't end up in landfills causing further pollution, someone to make practical furniture that makes our lives easier, someone to call on when our faucets break and our cars give out, to design better products with attention to detail and expertise of skill so that they are efficient and easy to use. SEIs don't have the Te practicality for that level of work, and N types do not have the Si attention to detail for that. A craftsman is a skilled worker, not just nobody.
Heck just do whatever you want to do as an SLI and it will be useful somehow (unless it involves like murdering innocent people or something like that).