I can see the appeal to believing there is a planned obsolescence from the battery manufacturer. However, I have a hard time believing this is the case from the standpoint of the charging and battery management is done through the charge controller which is independent of the battery itself.
The battery is somewhat inexpensive by comparison to other laptop vendors. Plus, it is literally designed to be repaired if it wears out or is defective.
If someone honestly believes their laptop battery is degraded they should start a case with support and let them determine if it should be replaced under warranty. Otherwise, it is a wear component similar to cell phone batteries. The big difference is its ease of replacement.