Should apple be aware of this, problem, bug?

Hi all. Here's something curious I noticed. For those with normal function keys, you can press them to raise and lower the volume. with touchbar macs, the keystrokes are, function key plus voice over, and the equals and minus keys respectively. Now, both mac users, try these steps to reproduce this and see what comes of it.
Go to any web page you like. Next, open the list of either links, or headings, or fields or however you have it ordered. Now, try to raise or lower the volume. If you do these steps, you will hear the piano note but volume will not change. Should Apple know about this? Again, with touch bar macs, the only keys you can use, are the ones above. so what if your speech is loud watching something, and you want to turn it down, you can not until you escape out of it, then lower the volume. Let me know. I haven't done anything yet.