The "2-4 official languages" dictum is usually put in place after the company churns through those 2-4 languages in the first 2-4 years of its existence. Basically everybody realizes how costly it is and says "no more". At least that's how it was at Google, which is perhaps the most famous example of the "We have 4 official languages, and you're not introducing a new one" policy.

I've worked in startups that tried to implement the "1-2 languages only" (usually Java and Jython/JRuby/Groovy) policy as a startup, and they didn't go anywhere. That team of prima donnas who is willing to mortgage the startup's future in order to ship an awesome product seems to be a necessary feature of startup success, and only successful startups get to hire the team of professionals who will button down everything, choose "official" languages, and build tier-1 infrastructure. So yes, it's incredibly unfortunate, but this is the industry we live in. Pick which role you wish to occupy accordingly.