But how far forward or back? It makes a difference re ability to get preferred meal, may have proximity to a bassinette (no thanks).
For example I will never agree to move into row 1 on a QF737 because I do not want my handbag in the overhead bin, I want it with me at my feet. I consider 1C/D a downgrade over 2C/D.
Coming back from CNS I was moved from 2D to 1A (5 mins before boarding) and without consultation because someone who got a last minute upgrade waned my seat to sit next to a friend. Luckily I had screen shot of my original seat on boarding pass from 2 hours earlier when I arrived and dropped bag) and I insisted on being moved back to 2D as I had chosen row 2 for a reason and done so 10 months out.
The friend gave me stink eye the whole flight, but not my problem.
Now on my flight from SYD-WLG a few weeks later I was asked nicely at the lounge if I would swap from 2D to 2A and given it was a short flight I agreed as was still row 2. But request was asked nicely, not a demand from a entitled so and so that was lucky to get an upgrade.