http://blog.eladgil.com/2021/02/when-executives-break.html
CEO you need to optimize for an entire organization over a single individual. In general, high growth companies should set expectations around the “Accordion approach" to responsibilities in a startup – peoples responsibilities may grow, then shrink, then grow, then shrink, as the org scales and that is OK. In the long run there will be great opportunities for lots of people to do meaningful work and to have an exceptional career if they put ego aside and stick to it.