It also makes your code harder to follower because you are using SCREAMING_SNAKE_CASE instead of nice, readable methods.

STREAMS originated in Version 8 Research Unix, as Streams (not capitalized).

Notice that the HTML elements (BUTTON, DIV, etc.) are in CAPS. We know this is bending the standard Ruby style rules slightly, but we think it reads better this way.

As was mentioned in the comments above, the material design spec for buttons specifies that the text should be uppercase, but you can easily override its CSS property: paper-button { text-transform: none; }

Choose sentence case or title case over uppercase. (This being said, Material Design does use buttons with uppercase labels.)

All-capitalized letters are hard to read.