shell - What is the purpose of 'tee'?

All the usages of tee I ever saw were such:

 do_something | tee -a logfile

Or:

do_something_else | tee logfile

Is tee invented for those that don't know you can do the same with shell pipe redirections? Such as:

do_something >> logfile

Or:

do_something_else > logfile

It's practically the same and it takes less keyboard hits to type out. What hidden features am I not seeing in tee?

Comments

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