@Werner Stinckens​ you can think about the Databricks Runtime as a contract. It does and will change over time. However, we offer Long Term Support versions of the runtime which offer multi-year support. If you have production jobs, I would definitely consider running them on an LTS version. However, as the LTS version phases out of support, please consider migrating to a newer LTS so you can take advantage of the thousands of improvements we release every year.