SVG icons are tricky for accessibility. Some browsers/screen readers combinations announce the SVG <title> (if any) no matter what you try to do to avoid it. Even adding aria-hidden="true" to the icons doesn't work for some combos.

IE 11 + NVDA:

IE 11 and AViewer (see the SVG title is part of the calculated accessible name):

Are the <title> really needed? Is there any case where we'd want the SVG icons to be announced? I guess the titles could be entirely removed, and when UI controls that use the icons need to be labeled, that could be done on the controls, for example:
<button aria-label="Some label here"><SVG here></button>

@davidakennedy and @samikeijonen could chime in here, they have a lot of experience with SVG icons for all the job done for Twenty Seventeen 🙂