Have you ever worked on a car? Tons of specialized tools can be needed for some tasks. Do you have a set of triple square bits? General purpose puller? Bearing extraction tool? How about half inch drive Tor-X sockets? 200 ft lb torque wrench? When you work on a car for fun, you find that your collection of tools balloons just for all the things on the car that require one specific tool. If you think you can do everything on the car with just a simple socket set, you'll wind up stuck and having to buy a new tool for every task.
Yes, although granted when I said "almost all repairs" I did not have in mind major automotive work, but more along the lines of general maintenance and little things going wrong. Of course if you're doing something like rebuilding the transmission you'll need more tools than the average bear.
Fair enough, but my point was that for things where you'd benefit from a mechanic walking you through a task, you'll probably need some specialty tools to do the job.
