This reminds me of that co-op where everyone except me and a Lynette didn't We carried the team as the best anemo girlies!(DPS Faruzan and DPS Lynette)
Why wouldn't you do that? You need an electro character to activate the shield, and Raiden is the strongest electro character. It makes perfect sense to use her.
I lost 50 50 then i had to do 75 wish more i could have used on wepon banner for which i only had 60 and with them i am still 10 pitty short to get 5 star wepon it was just bad luck