

There actually is one "positive" thing about collab banner
There is a lot of negative things with this banner but I think there is one good think that I should point out.
If you want to get one copy of Lucy without relying on "luck".
What I mean is that you're ready to use 160 pulls.
Because 80 - is 50% to get Lucy, and 160 - 100% to get Lucy.
So now if you used 160 pulls in collab banner you can end up with 1x standard 5 star and S0 Lucy and you can grab 1 waveband. So here you would end up with 1x standard 5 star and S1 Lucy.
Now if you used 160 pulls in featured non collab banner you end up with 1x standard 5 star and S0 featured character.
So from collab banner you can end up with S1 character while from regular only with S0.
Now lets compare how much corals you would get:
(again with no "luck" so every 10th pull gives 4 star weapon/character)
from collab pulls:
2*14+25+12=65
5*14+25+12=107
So from collab it's between 65 and 107 corals, and that is between 8 and 13 extra pulls.
from non collab pulls:
3*14+30+15=99
8*14+30+15=157
So from non collab it's between 99 and 157 corals, and that is between 12 and 19 extra pulls.
So from collab you could get 4-6 less pulls back from corals.
But we can get 20 free pulls for collab banner and if you're going for 160 pulls you will earn 15 extra. So in the end you would have to use astrites for 125 pulls rather than 160.