I'll keep it short...
Yeah, you are right. Winning the battle can be achieved otherwise.
You have 3 options:
1. you start with your first account and don't care what himes you get from the 6k tutorial jewels
2. you reroll until you have a core Hime for a element or 2 good SSR from the same element
3. you reroll until you get an 100% Eido
I am starting to think that you aren't a logical person...
Even a SSR Core Hime for one element or 2 good SSR Hime will make you life so much easier as a newbie...
You have a good starting Hime and now you can start to max this element. After 1-2 month you will have a very good team that can do most of the current contents solo. This team will be your wildcard for months!
Now you are going to start to upgrade your other grids until they are good enough that you can run with elemental advantage and do more damage than your main team.
A FUCKING 100% EIDO will just make your team for this element just OP...
You don't need a 100% Eido to win every battle but dude those MONSTERS will just make you life for later contents (Guild Orders and Tower) so much easier.
You don't need to have one but you should always choose a 100% Eido as a support Eido.
YOU CAN PLAY HOW YOU WANT! THAT'S YOUR DECISSION BUT PLEASE DON'T TELL NEW PLAYERS SUCH A BULLSHIT!
If you have the choice to start easier with a good core hime or a 100% Eido then you should always reroll!
Basically you should always reroll for most of the gatcha games.
PS: ZenMaster please try RANK 3 or 4 Accesory quest... with your current team and strategy you will have a lot of problems!
Don't even try Guild Orders or Tower.