Early Bird is offered only on selected flights from very few airports (WAW not included), so it's not really attractive.
Starting from June 2020 Fly Smart won't be offered on LH, LX, OS flights, but it will still be offered on LO flights.
However, LO has their own really attractive last minute mileage deals in Y for those residing in Poland and flying out of Warsaw (European flights 10,000 miles RT, USA 25,000 miles RT, Asia 35,000 miles RT).