Mostly because when you’re writing a fictional story, you need to remove everything that isn’t necessary for the plot. Is your story about racism? Then your ghost being racist makes sense. Otherwise unless it’s a gag it slows down the plot.

If we wanna get REALLY picky though…

Most ghosts probably aren’t speaking modern English either. A LOT changes in 200 years, how much slang rose and fell in that time? How much did accents change?

The concept of time was massively different too. Keep in mind before trains visiting a state could be weeks not hours. Could explain why ghosts are so patient though.

There’s also just vast differences in priorities, imagine a life where water is a constant mental calculation like your battery life on a phone. If they’re old enough that was the norm.