4) The other new "Light&Relax" has a very attractive feature "Change to an earlier flight on the same day" with a note "Change to an earlier flight is possible at the airport and subject to availability in the same travel class." Does this mean that SN is following LH in zeroing out anything but Y/J on the day of departure?
On the brighter side, I had very good experience this fall with this "change to an earlier flight". SN did not zero'ed out all the classes and I was always (4 out of 4 times) able to change to an earlier flight.
A strange side effect that will certainly not last : it looks like emergency exit rows are the last assigned (and not availabled during OLCI), meaning I even got one half of the time, when the flights were >95% full.