Those were films for mostly for old school linear or public network television, and therefore limited in subject matter highly reined in by network "standards and practices." I mean ads have to be sold... From 1966 to the early 90s those winners were largely split between both (Brian's Song anyone ?) From the early 90s, dominated by HBO and then Netflix. Last year, Disney +'s CHIP AND DALE RESCUE RANGERS. I think we are talking about a very different animal when directors like Fukunaga, Scorsese, etc. are making films for Netflix for an adult audience with an R rating...But TV movies have existed for decades.
They have an Emmy category called "Outstanding Television Movie"!