Originally Posted by
rjn21
Some people found those alerts useful - so they know if they have selected a seat in advance, and the airline then changes the J/Y config, they are at risk of being seat shifted to a random sub-optimal seat wherever the computer drops them into, so they should check their seating allocation to see what has happened.
THIS IS IT!
Especially as, e.g. Lufthansa prefers bumping you to row 30 or so without letting you know.
The other thing is: when the layout changes, new possibilities open up (e.g. you can now reserve a seat as some become available whereas you weren't able to before).