Welcome to FT.

You have received a very generous compensation for your inconvenience.
Exit row does not guarantee privacy or the endless legroom. I do not think following up on it will result in a positive outcome.

Admittedly it's not very nice facing someone for an extended period of time, but it happens on a long train journey at times as well, with people sitting across the table etc.

As for safety being compromised, I really don't think so, at all, if they weren't doing anything extraordinary or odd.