If anything, a solid counter argument can be made that Romance languages (descended from Latin) lack the flexibility of English and other Germanic languages.
Non primary English speakers frequently complain that English is more complicated than other languages. This is true. I'm a native speaker and only can read limited Spanish. Where I get hung up is the dependence on gender of objects. Similar experience with Japanese when I was studying that a few years ago.
I completely believe that primary language has a physical effect on the brain in terms of neural structure. It must have.
But since English is so adaptable, if there's a concept that is better expressed in another language we tend to adopt the words of other languages to express it.
However other languages seem to be less adaptable. For example, France has or had an official government ministry for decades to manage new foreign words entering the French language. To this day, there are newish specific French words for technologies coming from English speaking countries.
Another good example is some YouTube videos from India I've run across. (I turn on subtitles). But say the speaker is talking in Hindi. Many times more technical terms are English words or phrases that are freely interspersed with Hindi. They're borrowing the English words, with a bit of a Hindi dialect hitting the pronunciation.
Going back to Japanese, we see the same thing. I don't know if the JP gov has a language ministry.
But if you look at written Japanese text you definitely see that most numerology is written with western/English 0-9 characters mixed with katakana or hiragana. When you hear people speaking, and once your ear is oriented towards Japanese sounds, you can start to pick up on the adopted English words that are said with a native dialect emphasis.