If you are doing amazing work that benefits hundreds, thousands or even millions of people, but nobody is paying attention, then it will be really hard to justify it.
Conversely, shallow stuff that might only benefit a few but gets tons of attention, is easy to justify and keep going.
Two engineers. Engineer A working on the new shiny prototype stuff that is riddled with bugs and errors and never goes to production but gets to demo it to the upper management.
Engineer B grinding away on the old "legacy"system fixing bugs adding some new small features generally keeping things going.
Who do you expect will be getting the bigger RSU package? Unfortunately it seems that often the key factor is indeed visibility.
If your compensation is based on visibility, then communicating the importance of your work is as important as doing it. If your company will pay you more if you spend less time working and more time communicating about your work, then you should make that adjustment.
If you don't advocate for the work you do, or yourself, you're making it harder for EVERYONE.
Humbleness is fine, but laboring in the shadows on critical stuff makes it harder to allocate resources to where they are best directed (like you and the work you do!).