If a player has invested into a commander and they decide to change the entire use case for that commander including skills and skill trees then we should be compensated appropriately.
I believe that we should be refunded all heads /stars invested into that commander and that we should be given the choice to reinvest if we like the changes.
Same principles apply if they changed stats on equipment, imagine youve made a full set of gear and they just removed the set bonuses. Or changed an armaments inscription to do something completely different.
Im happy for lilith to make changes to improve the game. But the player should always get a choice as to whether that investment is still right for them.