This is is true in my experience. I studied abroad in Costa Rica back in 2002. Someone gave me a book of 500 Spanish verbs with conjugations. I became fluent in Spanish by studying only a few hundred of the verbs in that book — no vocabulary. I frequently reflected on how I was able to speak a foreign language with mastery of just ~250–300 select verbs.
I really love your project. It is awesome. Super easy to install and you made a wonderful documentation. Starting today I am fan of your project.
Thank you for your hard work. Projects like this are wonderful.