I've made a lot of tools - chisels (bench and mortice), saws (dovetail, crosscut joinery, tenon), knives, marking gauges, and a wide range of plane types (plough, smoother, jack, jointer, router planes ...). Most of them are used, a few some of the time, and some a lot of the time. It is also nice to know that others are using tools I have made. Plus I have contributed to the design of tools in manufacture by companies, and many use these tools without awareness of this.
Bottom line: I could get by exclusively with tools I have built, and not resort to any manufactured tools at all.
Happy to post pics here, but they may bore the **** off most.
Regards from Perth
Derek