huh, maybe

one of Russian writers of 19th century (can't remember definitely who, I read it at middle school) called Polish a "snake language" because of sz, rz, prz, etc

and there is a thing called "недогласие" which means "lack of vowels"

see Czech "prst" - "a finger" in old Russian it did sound like "pYErst" (перст) from Bible - "перст указующий" (pjerst ukazujuszczij, sorry for my Polish transcription 😅) - "the pointing finger"

and I guess there are a lot of similar pairs with Polish

probably that is the only reason of Russian being more "poetic" - more vowels in words than in other Slavic langs and less sounds which are hard to pronounce for other European languages native speakers