Sorry, originally wrote this in a different post, accidentally responding to both Max and Lanefan. Separated out the Lanefan response here. My apologies.
Isekai, lit. "another world", is a genre that grew out of manga and anime, for stories where a person from a fictional version of our real actual Earth (or at least an Earth that is extremely similar to our own) gets "sent to" a parallel world of magic and fantastical adventure. Although the stories long predate the term "isekai" being used,
The Chronicles of Narnia would be an entirely Western isekai fantasy, with the titular Wardrobe acting as the first (published) story's "portal" for traversing between worlds.
It is stereotypical (but not actually required) in isekai stories that the main character has either died in our world and thus reincarnated or been soul-swapped to the fantasy world, often (but far from always) in a body extremely similar to their previous Earth body. This is where the meme "Truck-kun" comes from (truck + the Japanese honorific meaning something like "friend" or "buddy", meant for a male friend implicitly younger than the speaker). An
extremely stereotypical beginning of isekai manga is that a depressed teenage boy in Japan gets run over by a speeding truck in the first few pages. He thus dies an almost instantaneous, painless, and (theoretically) blameless death so he can get to the other world quickly and cleanly, no muss no fuss, no icky implications, hardly even moral ambiguity for the truck-driver. As a result, people made fun of the over-use of this plot element by characterizing "Truck-kun" as an actual character, who appears in many different manga for the sole purpose of killing protagonists so that they can reincarnate in another, more interesting world.
I would
assume "the isekai vibe" would thus be the
feeling of the overall above fantasy--a character who is functionally "the actual player, just if they'd been born in the fantasy world and coincidentally developed the same personality". If so, then I'd guess The Firebird finds this a negative distraction, sort of the opposite of immersing oneself in the world--keeping oneself unchanged despite theoretically coming from this fantasy world.
I think you've mixed me up with someone else on this one.
There's loads of places in my setting that I haven't fully defined. Some of those places are vaguely defined e.g. I know there's a great big faux-Chinese empire to the far south but other than the names of a few big cities nothing's been defined about it at all yet; and the city names are only so I'd have something to put on a map.
And I don't even know the names of minor government functionaries in the city the PCs generally use as their base. There's about 40,000 NPC people in that city and I might at the most have named fifteen of them.
Then I sincerely apologize, and yes, I must have conflated you with another poster. I know quite well that someone on here
does do this (it's come up in several threads), I just misremembered that being you. I appreciate your patience with that error on my part.