If mine just says ©2020 and theirs says ©2012, my argument that I created mine before they created theirs is weaker than if mine says ©2008.
At the least it means my lawyers will have to take time to explain to the jury why mine saying ©2020 doesn't contradict my argument. They may need to spend time presenting archives to bolster this, and then may have to spend time explaining how archive.org or similar works, and establishing that those can be trusted.
Each side in a civil trial is allotted a fixed time for arguments, rebuttals, and summaries, so any time my lawyers have to spend in court dealing with my ©2020 is time not available for most important things.
If mine just says ©2020 and theirs says ©2012, my argument that I created mine before they created theirs is weaker than if mine says ©2008.
At the least it means my lawyers will have to take time to explain to the jury why mine saying ©2020 doesn't contradict my argument. They may need to spend time presenting archives to bolster this, and then may have to spend time explaining how archive.org or similar works, and establishing that those can be trusted.
Each side in a civil trial is allotted a fixed time for arguments, rebuttals, and summaries, so any time my lawyers have to spend in court dealing with my ©2020 is time not available for most important things.