I'd rather have my wife ignore me for a few minutes to deal with a work e-mail than not go out to dinner with me at all because she has to stay late to make sure the boss is fully prepared for the big meeting tomorrow. Because that, realistically, is the alternative.
Is that realistic state of affairs something you love, and should be encouraged, or would you rather have clearer work life boundaries so your wife could also choose to spend time with you without worrying about work?
I do love it, because its the same blurred boundaries that let me take a long lunch, leave at 3pm, or just spend an hour doing personal stuff during the day.