I finished my 20s with a PhD in fusion energy, and I discovered I was useless.

Jakubowski contrasts elite academic achievement with a felt lack of practical agency. The line suggests that highly specialized training—here, a PhD in fusion energy—can leave a person unable to meet immediate human needs or to build, fix, and produce tangible things without institutional scaffolding. Calling himself “useless” is rhetorical self-critique aimed at a broader system: education and professional pathways that reward abstraction and narrow expertise while neglecting hands-on competence, self-reliance, and socially legible impact. In Jakubowski’s wider ethos (open-source, appropriate technology), the quote functions as a pivot from credential-based status to tool-based empowerment and community-scale problem solving.