In other words, they like the fact that it has features typical among languages oriented toward functional programming.<p>There&#x27;s no cost-benefit analysis here discussing the obvious pitfalls from a business perspective, such as a much reduced talent pool and probably higher salaries for the few programmers who are comfortable working with such an uncommon language. There&#x27;s also no discussion about why they believe a business offering a calendar application needs to use such a technically demanding language. This would be more understandable for, say, Jane Street (high-frequency trading), but for this particular business my naive belief is that this probably will not be the &quot;competitive advantage&quot; they claim it is.