Hola Kevin

Sorry for our late response.

The use of articles in Spanish, such as "el" in "la llegada de la atención plena", can be influenced by various factors, including context, emphasis, and established phrases. In this case:

Here, the absence of the article before "atención plena" could be because the phrase is treating "atención plena" as a more abstract, general concept. It's discussing the idea or concept of mindfulness in a broad sense.

Here, the definite article "la" is used before "atención plena".

This could be because the phrase is referring to a specific event or moment—the arrival of mindfulness. The use of the article adds a level of specificity, indicating a particular instance of mindfulness being introduced or coming into focus.

In summary, the choice of whether to use an article can depend on the nuance the speaker or writer wishes to convey whether discussing a general concept or a specific occurrence.

Un saludo y gracias por tu paciencia.

Silvia