Realism is often tough to come by in Isekai. The very concept of being reincarnated into a fantasy world of magic and monsters doesn't lend itself very well to reality as it is. Add to that the fact that most isekai protagonists are overpowered heroes with an ever-expanding harem, and the true draw of isekai as a form of escapism is fully realized. While there's nothing inherently wrong with that, it's inevitably what makes Mushoku Tensei: Jobless Rejncarnation's Rudeus Greyrat feel like such a breath of fresh air for the isekai genre.
Source：https://www.cbr.com/mushoku-tensei-rudeus-greyrat-relatable-isekai-protagonist/
