Counting words and 们 aren't the same, as they aren't declensions. You add on the syllable rather than actually changing the syllable of the noun itself.
Granted, that's still different from saying that Mandarin doesn't have a concept of plural, but I think the underlying point- no conjugation or declension- is very different from the other languages being discussed.
Granted, that's still different from saying that Mandarin doesn't have a concept of plural, but I think the underlying point- no conjugation or declension- is very different from the other languages being discussed.