The SEIR model is famous as some countries such as Malaysia use it to predict emerging infectious diseases such as COVID-19? What makes it famous among other mathematical models, agent-based model etc.?
perhaps it is famous at some countries simply because of "historical" reasons ...
technically, in the Spring of 2020:
... some researchers from Singapore University of Technology and Design launched a website presenting the predicted CoViD-19 end dates in various countries across the world ... perhaps the site is not active anymore ...
however, every week, there were plots - posted - like in the attachment - for almost every country in the world where public data have been available ...