You didnt actually disagree again.
Lux fills very specific roles for her team which is what support champs do especially support mids.
morgana is a mage... she does mage stuff. she tosses **** at ppl and peppers them with magic damage and snares and nukes them when she can. She doesnt need any special team, she does mage things no matter what. Lux prefers a well thought strategy
Morgana's role is actually MORE specific when you come down to it, but better for pub-stomping morons. What part of this do you not understand?
Morg = Anti-Mage/Anti-CC + AoE CC + sustain.
Lux = Poke + Burst + AoE CC + Push + AoE shield + ultra long range.