I think that competition can be healthy. Take for example all of these node package managers (npm, yarn, pnpm, etc.) There is most certainly competition between these various package managers to provide the "best" solution. However, all of these groups actively communicate with one another and as a result they have all improved for the benefit of the community as a whole.
I think where competition becomes unhealthy is when it pits two individuals against one another in a way that either one or both of the individuals become resentful of one another. It is certainly possible to have healthy competition - when that competition does not become internalized. The moment it steps beyond code and people start feeling personally attacked I'd say it is no longer healthy.
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