Making it up as you go along isn't inherently bad. Nine times in ten I prefer a story which is planned out but basically any medium that's open to additional seasons, novels, sequels, etc is capable of falling into this category.
It's only really a sin when the medium promises a long form mystery while doing this, hence the fact Lost is #1 here. Sherlock Holmes was written as episodic mystery and Arthur Conan Doyle clearly never planned future stories as he went and nobody minded. Togashi, the manga author for Hunter x Hunter stumbled into his most famous arc just because he'd made his metaphysic and societies up as he went and the stars aligned, leading to the Chimera Ant arc. The Simpsons rarely ever changes it's status quo between episodes, and therefore can be made up as it goes along, because it's going nowhere. Breaking Bad literally changed the ending of season one to not kill Jesse partly due to the writers strikes and subsequent shortening of the season, and Mike as a character exists because Bob Odenkirk was busy.
Any medium that decieves the audience, promising a well reasoned, long form mystery without any planning of what that mystery is, is bad. Perhaps you'll strike gold and have an epiphany as to how to bring the plot together perfectly, but that'll just be luck. Ultimately this is an expression of consumerism; baiting the expectations of art and narrative to deceive the audience for nothing more than engagement, and therefore money.
Blurry photos is fine to make an stylistic choice. The 2019 movie The Lighthouse stylistically looked like a 1920s film, before modern music intentionally used bitcrushing, it used vinyl cracks, boomer shooters made in this decade intentionally look like 1990s Doom clones.
When a medium's shortcoming is patched by technology, it ultimately becomes an artifact of the era where it was accidental. Once a few years have passed, it becomes more synonymous with the era than the mistake.
It's not necessarily nostalgia, Gen Alpha and the younger half of Gen Z never grew up without smartphones, so they don't miss the era of poor film photography. Although every generation does this simulation of forgotten mistakes, it's particularly poignant now, where the high quality, perfectly lit, professional feeling photos convey something artificial, i.e. smartphone software emulating camera hardware, faces tuned with filters or outright AI generated content. Even if it's false imperfection, the alternative is false perfection.
Art using deliberate imperfections that were unavoidable in the past is romanticising something perceived as before commercialism, and that's admirable.