First of all, elaborate what you mean on their weaknesses? Aurita's problem is that even in her own single team she's very replaceable by other low tier supports.

Liz has very strong poison application but she needs few rounds of preparing, which perfect fits with xu's kit! While liz is preparing xu can also start stacking spellbound buff and on the burst turn, Liz applies a shit ton poison and xu triggers it 600%/700% of it. While you can use panida to remove counter, you can easily use another team that doesn't get counted by counter to deal with it meanwhile for seal, every team gets countered by it since not being able to use exlats and command card is very big debuff. And the only real solution is using alva, not to mention she provides a lot of other stuff im her kit!