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The series emphasizes more nuanced consequences of an "average" person being reincarnated in an unfamiliar world, such as what personal flaws from a former life would be carried over and what it would actually be like for real parents to raise a child with the mind of an adult. This made it new and interesting all over again, since most of its imitators would skip or ignore most of that stuff in favor of the familiar tropes and new gimmicks...

After Mushoku Tensei popularized the Reincarnate in Another World genre of isekai, most of its imitators skipped past the hero's childhood and culture shock of being reborn into a strange world with Past-Life Memories, usually leaping into the Harem or Power Fantasy.
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