主题：【原创】闲话93：稳扎稳打和步步为营（上） -- 井底望天

organization leadership requires language proficiency, esp., in English. Capability in public speech is also very important for leadership role.

In US top-tier private school, one component of the leadership training is about public speech (and presentation) skill.

BTW, since European languages are very similiar inside one language family. Therefore, proficiency in multiple languages are not a big challenge because some are just a small variant of the other, e.g., Dutch and German.

Therefore, multilinguism does not hurt depth in the European context.

As to the Southeastern Asia languages, they are often too different from each due to the separation by mountains or ocean, therefore, your conclusion could be quite right.