For the unfamiliar: "la sombrita" is the name of the corrugated metal piece on this bus stop post. It is designed to provide shade to people waiting for the bus, because the areas where these are installed have very little shade.
Due to a multitude of reasons from NIMBYs to building codes, it's difficult for the city to install anything much bigger or better than this.
If you find this interesting, you can learn more by listening to episode 545 of the podcast 99% Invisible. It's called "Shade Redux"