Other reasons for the Algebra 1 rigor: 1. People succeed in many jobs without understanding Algebra, but understanding Algebra makes it easier to succeed. 2. It solidifies a logical, step-by-step thought process. 3. People who understand Algebra recognize when attempts are made to mislead though incorrect logic and/or intentionally erroneous calculations. (Ethan Demme Blog: https://demmelearning.com/learning-blog/3-reasons-why-we-learn-algebra/)