Is actually why I am perplexed, as I can do it; most should be able to play, too. But this is a main factor why I do not play TW3, and the other is excessive ESRB content. Maybe if they had a Toggle....
Witcher is a deeply European feeling game I think - the buildings, the scenery, the music, dry humour, boozing, shagging and yes, the language ... I still smile at the Brummie troops' accents (those trebuchets are...) - people do actually sound like that where I live... and they often swear more. Even the casual racism I'm sorry to say (though it's elves, dwarves and Witchers in the Witcher), number of times I've heard "I've got nothing against X, Y or Z but..." followed by a mind-bogglingly racist, sexist or homophobic comment from someone who doesn't think they're being racist, sexist or... yeah - there are many things about The Witcher that feel authentically "old world" to me as someone who lives in the UK and has travelled around Europe a bit (France, Germany and the Netherlands anyway - not made it to Poland where CDPR are from yet). The Empire of Nilfgard even feels like a comment on "Russian Imperialism" - you have to remember that Poland was part of the Warsaw pact until only about 25 years ago.
The gameplay is different too - far more twitchy especially in TW3 where I think they've pretty much nailed fluid swordplay; it plays more like a hack 'n' slash FPS than any of BioWare's games which still carry the Neverwinter Nights heritage to some extent.
Ostensibly it might seem similar to say Dragon Age being a swords and sorcery hack 'n' slash game - but there's something fundamentally a shade darker, a shade more cynical and self-deprecating, a shade more, well, European about the Witcher and if they were to curtail that it would lose something for me... that's how I feel about it anyway.