That's needlessly aggressive. Ignoring webapps, you could do gamedev without even knowing what a matrix is.

You don't even need such construction in most native applications, embedded systems, and OS kernel development.

This is my exactly point. Even in a highly specialised library for pricing securities, the amount of code that uses matrices is surprisingly small.

I am working in embedded. Had to optimize weights for an embedded algorithm, decided to use linear regression and thus needed matrices.

And if you do robotics, the chances of encountering a matrix are very high.