It should be more self-evident now.
When there are many tools which meet the minimum requirements for doing a job, then the focus becomes not on which tool can do the job, but which tool you feel does the job the best (or you enjoy using). Carpenters argue about the best saws/drills, artists argue about the best brushes/paints, musicians argue about the best instrument maker.
You're right, customers don't care about what tool was used to build something, but they care that you can do your job well and good tools help you do that.