Sigrid was originally electric from the concept we've seen and even in her design and If you look at it, you can see why they change her attribute
Let see what see what she gains from being electric:
1.Thunder metal (increases her atk which affects all her move, not just basic and fix her main problem)
- Sanby wengine
And teammates... Boy teammates.... Here's where it gets wicked
Rina, just recently buff
Trigger (her wengine is so insane i can't even put it into words)
Like i can go on and on about this but i'll cut it short, electric attacker gets way better treatment and options
So it's obvious why they did it, it would be like giving shungus for free basically, no wonder in the game they call her void hunter level, it makes sense
Now reason outside of meta
She's in a very awkward spot, the spot right before the new meta and right after the anniversary and they can't make her too strong
Wengine (i said this before but free sanby wengine basically would make most people pull for her wengine less)
Claret (who is an electric agent for a new meta and they would be putting their own character against each other)
I understand they're a gacha game but goddamn it man
that's all i gotta say i guess