I knew a guy in Pittsburg that was transferring all the Mr. R. Neighboorhood 2” video reels to digital formats.
PBS NEVER erased any of those programs, while hours upon hours of early TV videotaped was recorded over and lost. That drek was preserved underground THEN more $ spent to archive it - ?
There’s a lot of old early T.V. broadcasts that were never saved to tape, a lot of them more worthy of saving the Mr. Rogers, IMO, but that’s just me. I guess somebody out there must have enjoyed watching it? Go figure.