For web, front-end, or mobile apps (excluding games), I agree math is not necessary. These type of apps rarely uses math, they simply streamline data and present it on the screen. It can't hurt, but it isn't a criteria when I interview developer.
Of course, once you get into back-end systems, data analytics, and algorithms, math becomes much more useful, if not a necessity.
I've done quite a bit of front-end work and one of the teams I was on built a large graphing application. It required algebra for some of the plotting routines, but nothing too major.
It wasn't until I got into relational databases that I saw you really needed more applied mathematics to be a good database designer. Then you start to read about Dijkstra and Codd and suddenly realize your HTML, CSS, JS world seemed rather small by comparison.
Yeah, and it's REALLY important for graphical programming. Vectors, Matrices, and Quaternions nearly killed me when I started doing work that required it.
Of course, once you get into back-end systems, data analytics, and algorithms, math becomes much more useful, if not a necessity.