As a fellow Pole, absolutely not. When I communicate in a foreign language, it's about accurate information transfer. Then again, I don't write or compose poetr

As a fellow Pole, absolutely not. When I communicate in a foreign language, it's about accurate information transfer. Then again, I don't write or compose poetry/marketing copy on the daily. Beyond a certain point, there is simply no return on investment to sounding more and more like your target audience. You need some basics, but beyond that, if you are valued by your target audience, they will listen, take you seriously, accept your legitimacy as a fellow person whose wisdom is worth knowing even if the content or style diverges from the schema. If they cannot accept your offer in good faith, then I would disengage rather than push past that.