>>3418There's thousands upon thousands of tv specials, films, OVA, etc from 1970-2001. Unless you are very specifically obsessively collecting these rips and watching all of them then, no, it's not possible. There were so many thousands of OVA especially and most of them are forgotten about.
A lot never even got DVD releases since they are from companies that went under, or are obscure enough no one has cared enough.
Do you follow Lonelychaser, Kineko, Oprhan and others? Pretty much all of those are new to me.
I thought I knew the OVA era, but I had only seen the dozens of most notable. Truth is, most of these are pretty forgettable or cliche as well so you are not missing much. The big famous series all got DVD/BD releases, so everything else is the shit even Japan doesn't care about.