LOL

I know exactly what you mean. I've just been dealing with a classic "trenchcoat and katana" player straight out of 1997 - "I've spent the last 10 years playing World of Darkness", was his comment - and politely encouraging him to decide that my D&D campaign based on the works of CS Lewis & Tolkien was perhaps not the best place for him...
Edit: Although I don't think
Spelljammer is a trenchcoat & katana setting as such. I think it's a bit older - late '80s?
IMO,
Spelljammer fits in there: it's D&D ala space opera, much as
Dark Sun is D&D ala post-apocalyptic or
Ravenloft is D&D ala WoD (not that the PCs can necessarily be monsters as in WoD, but there's the aura/aroma of a "world of grim mystery, horror, & terror" permeating the setting much as in [old] WoD).
IMO,
Planescape falls in the same category, though I'd compare it to being a Much More Serious take of the multidimensional worlds ala Robert Asprin's
Myth Adventures—Sigil might as well just be the Bazaar on Deva, with Skeeve's homeworld of Klah as the Prime Material plane. It's just been made using the classic Great Wheel instead of a bunch of random dimensions with an individual theme. (If you will, it's a dimensional variant of the Sci-Fi style trope of single theme/environment planets, like the all-desert Tatooine, all-forest Endor, or frozen world Hoth; in the case of Myth Adventures, it's terrifying-aggressive-dangerous natives Perv, the sports-obsessed Jakh, the horror-themed Limbo, the hellish Deva, the tech-oriented Kobol, and the species-homeworld-related locales of Zoorik, Trollia, etc.).
However, IMO, it's all got that late 80's/all 90's flavor of "Something familiar, but with a twist!" to it. Shadowrun is cyberpunk with a liberal dash of magic & fantasy; Rifts is post-apocalyptic with everything including the kitchen sink thrown in; World of Darkness is horror, but with the PCs as the (sorta-humanized) monsters instead of the monster hunters/victims; TORG is an invaded Earth, but invaded by realities/concepts/genres instead of aliens.
All of that (for me at least) brings back memories of trenchcoat & katana stylings, clove cigarettes, boy bands, grunge rock, and the music getting scrubbed out of Music Television; just stepping out of the world of Jams, high tops, hair bands, fade haircuts, and mosaic stylings involving cut-out photos, irregular polygonal shapes, polka dots, stripes, and some combination/use of the colors black, white, pink, and day-glo colors.
But that's just my opinion.