That is each individual''s thinking. at school level, when you don't know what career you are going to pursue, having basic knowledge about everything is a must.
Most consider geometry, and trigonometry to be pointless. Think about architects - They cannot live without it.
People say commercial mathematics is useless.. How do you know at an age of 15 years that you are not going to need it in future?
Agreed, once you get into engineering, you don't need commercial maths, and quite rightly, it is not taught then.
In school, there is a huge likelihood that people would choose varied streams, and choice of careers. The syllabus is created, keeping in mind that it caters to future engineers, architects, businessmen, etc. Once you reach University level, and have chosen your preferred stream, it is then that you focus on the most relevant areas, of any subject, leave alone maths.
I wanted to do engineering. I chose science as the elective in 11th and 12th standard. After 12th got over, I decided to shift to Business management. Now, if we had been taught a very narrow, and focused area in maths, I might not have shifted. Since I had basic knowledge of the commercial aspects as well, it was a relatively comfortable change.
Just a heads up for those who crib that maths is irrelevant. It helps decide your future. If you don't like geometry, make sure you don't end up being an architect. If you think calculus is not your cup of tea, most probably physics will not be either - Don't become an engineer.
I liked commercial maths, and that prompted me to switch streams. I am successfully pursuing my bachelors degree right now.`