Serialization doesn't mean eternal serialization. Mini series exist. I'm currently watching the 80s Shogun adaptation. That thing aired originally as a 5 part mini (VHS) covering each of the 5 volumes of the original book, but TV syndication usually broke it into 30 minutes chunks (it does have some nice natural points of fade to black every that often). The version I have is 3 blu-rays but the whole thing paces like a 10 hour movie. Who cares, it's the same story, it has a start and an end, and several breakpoints you can choose. Even the concept of perpetual TV presence with endless seasons is stupid and makes no sense in a world of video on demand. It continues to exist because production pipelines are still designed to work in seasons. But the important part should be to tell a story and tell it well in the time frame it takes.

but the serialisation of everything is already so tiring

Frankly, that sounds like a you problem. Good storytelling is not at all tiring to me. You find complex stories to be challenging and exhausting, for some reason. I'm not making any specific judgments on that point. It just is what it is.

For the rest of us, the obsolete traditional movie medium is just too simplistic. Even Oppenheimer is a perfect example. The actual story of the Manhattan Project is FAR too complex and complicated to tell in a single sitting, to the point that I don't even have any interest in seeing some ludicrously compressed, dumbed-down film version of it. No matter how hard they tried to make it good, it'll inevitably just boil down to "hat man make big bomb."

I'm just not interested in that.

It would undeniably be better as a series. As would everything worth making, which was my original premise.