It can be frustrating when a device doesn't receive updates as expected, especially when it's capable of running newer software versions. Regarding the security patch level, it's possible that Samsung's update schedule for your Tab S6 5G might not align with the latest patches available. Sometimes, manufacturers prioritize stability and compatibility over the absolute latest security patches.
If you're concerned about the security patch level, you could consider reaching out to Samsung support for clarification on their update policies for your specific model. They may have insights into why certain updates are delayed or include older security patches.