Thanks for contacting Lingvist!
Regarding your suggestions, let us explain the reason why we have chosen Neutral Spanish as the base for our English-Spanish module.
As you know, there are five Spanish dialectal regions (México/Centroamérica, Andes, Río La Plata, Chile, Caribe and Iberia/Europa), which imply an enormous variety of accents and words -even grammar rules. Unfortunately, it is not technically feasible for us to include such range of differences in a single course, at least for now. Thus, Neutral Spanish allows the greatest number of Spanish learners/speakers to understand the message without the use of local terminology and certain verb tenses.
However, we will be adding more contents in the future as we understand the importance of offering a more in-depth view on the different varieties of Spanish.
In any case, we have also included the pronouns usted/ustedes in the sample conjugation tables that you can check in our Grammar Hints section, where you will also find some insights into the differences in the use of personal pronouns between European and Latin American dialects.
If you are interested in going more deeply into the dialectal varieties of Spanish, please check the following links:
We really appreciate your relevant and valuable feedback.