I haven't actually seen Dungeon Meshi, I watched the other popular elf fantasy anime that aired at the same time (Frieren) so it's like my hilarious genie curse that I am constantly surrounded by people talking about Dungeon Meshi instead, but this description reminds me of the core appeal behind isekai in general: A person maladapted to the real world whose specific hyperfixation (usually video games) turns into a superpower when they are sent to a different world. Outside isekai, it's the appeal of High School of the Dead, where a nerdy gun otaku becomes a zombie-slaying badass once the zombie apocalypse descends. It's the appeal of Stein's Gate, where a socially awkward misfit obsessed with time travel is put in a situation with time travel and becomes the hero who saves the day.
And it's the appeal of The Matrix, where a computer hacker learns the world is a computer and gets superpowers.
It's the lament of misfits everywhere. Compared to an otherworld story like, say, Harry Potter, where Harry has no skills at all and isn't even particularly smart but luck and other people and the circumstances of his birth allow him to be the hero, these stories are about (and for) people who DO have a skill, but feel like the current world doesn't properly appreciate that skill.
Attributing this problem to capitalism seems completely off base. We live in a world that encourages, rather than suppresses, hyperfixation and hyperspecialization, especially compared to a pre-industrial world where you were either a farmer (expected to do every possible task that can be done on a farm) or, if you were lucky, skilled labor, in which you did every possible task that can be done by a tailor or a smithy. Nowadays, your job can be a QA tester for a single software product created by a company that has 100 software products, this company being one of a million software products companies all creating different, hyperspecialized software products. Your job can be a doctor who only knows about diseases that specifically affect eyes. Your job can be a lawyer who only knows about the part of the law dealing with divorces. Your job can be a salesman who only sells used cars of a specific type of car brand.
The problem is that this modern world that expects hyperspecialization has, especially as leisure time and access to hyperspecialized information via the internet increases, a tendency to accidentally create people who are hyperspecialized in a way that society has little real use for. (Like people who are hyperspecialized to be good at video games.) A tiny part that doesn't fit in the machine. The dream of isekai is that the tiny part stays the same, but miraculously a machine exists where they are the most crucial component of all.