Why Kafka don't allow multiple consumers within Same Group to consume messages from same partition?

Note:
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Multiple Consumers from different consumer group can consume from a particular partition which is already covered in the introduction video on Consumer Group (you can refer the first prerequisite link)
Prerequisite:
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Consumer & Consumer Group in Kafka
• Consumer & Consumer Gr...
Kafka Consumer Groups CLI Demo | Kafka-Python
• Kafka Consumer Groups ...
Kafka Consumer using Python & Concept of Offset-Commit
• Kafka Consumer using P...
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doc.clickup.com/37466271/d/h/...
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[@user-or5gv9jt2i]

sir as you said that, there is no point in adding more consumers in a single group than no of partitions...what my doubt is if we add an extra or couple more as backup consumer so that if any consumer goes down then that xtra could add up to service, thus maintaining the stability as earlier. ?? is it better to add xtra consumers as backup. #kindly reply _/\_ sir