We usually don't have the patience nor spare disk space to spend days or weeks on creating a multi-terabyte tar-archive first.

I'm also rather skeptical that the common BT clients are made to handle files in the multi-terabyte range very well.

And finally, BT only makes sense when you're transferring to multiple destinations. There are better options for 1-to-1 transfers.

Well that makes sense. Thanks for the clarification.