Why no built-in TBC in 1980+ VCRs?

[DVtyro]

Originally Posted by ARC Tech-109

My Sony Digital Betacam (A-500/1) has a framestore system for BetacamSP analog playback. The head diameter is slightly larger in the digital decks so everything is transcoded digitally, timebase corrected and stored then buffered before feeding the video DAC, it also feeds the SDI port.

My two cheap early 2000s camcorders, PAL VHS-C and NTSC SVHS-C, have built-in TBC. This has been captured from the NTSC one: https://youtu.be/Lge8hlQrCLw Many Digital8 camcorders have built-in TBC, which is used when playing back analog recordings.