Why no built-in TBC in 1980+ VCRs?

[DVtyro]

Originally Posted by ppppenguin

General purpose TBCs had a tough job following all these errors on all sorts of VTRs and tapes.

Which is why it seems to me that it made sense to build a TBC into VCRs themselves, at least into expensive top level models, as manufacturers shoudl have known better what sorts of errors their machine produced. Ah, well.