[sidlls]

The operational support you note is definitely something that should be evaluated, but if there is a "hard no" policy in place that is a negative indicator about the engineering organization to me.

Generally having a small number of implementation languages in use shouldn't be an issue. In fact, languages are tools and some are better suited than others to certain uses. If an organization supports products of even modest complexity odds are multiple languages and other technologies are required in order to make it work properly.