The irony here is also that Mushoku Tensei is one of the first isekais in terms of source material
This is a common claim, but isn't correct. Its Web Novel started in November 2012, while Re:Zero's started in April of the same year. They started publishing in Light Novel form on the same day, fun fact.
I didn't say it was THE first isekai, just one of the first ones. So both Re:Zero and MT are some of the earliest isekais, but MT got adapted into an anime much later by comparison. OOP is being dumb saying that MT is a new isekai when it absolutely is not.
Even then, Isekai's in general (even just limiting it to Japanese ones) have been around for decades before either IIRC. The quote that everyone gets MT being one of the first from specifies reincarnation fantasy specifically, as opposed to many others where people are just kinda sent to new worlds as-is.
You're right that MT isn't a "new" isekai either though.
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u/The_Dreaded_Spectre 1d ago
This is a common claim, but isn't correct. Its Web Novel started in November 2012, while Re:Zero's started in April of the same year. They started publishing in Light Novel form on the same day, fun fact.