I would miss it and it would be immersion breaking if somehow 6 months (that's when witcher 3 starts) after witcher 2 people start to speak in a more educated way. Take Dragon Age for example. Everbody talks in the same highly educated way. No matter if you speak to some peasent who probably haven't read a book in his whole life or a mage who did nothing else than studying books trapped in his circle. In the Witcher games/world the people differ in the way they are speaking, which adds a lot to the atmosphere. Considering your example"ploughing", this seems to be more a game specific thing, as I don't remember people using this word in the books. Althought I read the books in German, so maybe I didn't notice it. But the general usage of swearwords was also very common in the books.
So is the usage of modern phraseology, but it's explainable with the lore as there is:
minor book spoilers
It would seem you missed the dialogue and banter in the DA series, as there is a distinctive difference heard in the varied social economical, and racial NPC's in the games. And while the uneducated may not have the practiced manners of others, status does not determine morality, civility, and character. And the frequency of profanity even detracts from the impact desired when it is used.
While those comparing it with the previous games and books may be aware of the loss, it would not be shared by those new to the series like myself. But then, I also try and avoid it in other places to like Forums; prefer BSN due to moderation rather than the lesser and more frequent tripe seen in comments on youtube and other such sources.
As for avoiding time problems, this solution is convenient, if not somewhat unpalatable.