My job in a nutshell:

*fixes app, so it's working 99% bug free*
*Chrome update*
*app is full of bugs*
*fixes bugs*
*iOS 10 comes out*
*app is full of bugs*
*fixes bugs*
"we can now remove iOS7 support"
*removes code*
*app is full of bugs*

For fucks sake!!

In the distant future people will write about "the myth of the software engineer" who spends his whole day debugging only to find that each bug fixed created hundreds more on a different OS/browser/device (google the Sisyphus if you don't know what I am referencing)

You are experiencing a case of severe job security ;)