A common saying in many fields, including design, is that "nothing is carved in stone." It means that things change, flexibility is allowed. Even such ingrained rules as "never set script type in all caps" or "serif fonts are more readable than sans serif" can be and are broken every day. But some font matters are carved in stone — literally.
There's even a digital font called Trajan, an all capitals font (like the inscription) designed by Carol Twombly.