[zsyllepsis]

> If all you have are TS developers, the. IMHO, you don’t have very good developers.

Does it change anything to reframe this as having a common denominator across all developers? As in, rather than “All of my developers know only TS” to “TS is the common language all of my developers know”.

Particularly in small companies I think it makes more sense to focus on a restricted set of tools and technologies. It makes interviewing easier, ensures mobility of hires to different areas of the code, and produces an easier onboarding experience for new team members.

> It is also boring using only one programming language every day

Interest and passion come from more aspects of a project than the language it was written in. Some projects are interesting because of they incorporate cutting edge research, some because they have highly visible impact on users, and others because the solution involves a careful balance of design constraints. Choice of (or diversity between) language doesn’t have to be the distinguishing factor that makes a project interesting.