SSRIs have much more clinical evidence of efficacy for addressing anxiety disorders vs a placebo than depression. The effect size is ~0.7 vs 0.2 in meta studies.
Also, IME they are dosed completely wrong. So many people seem to be on very low doses, which has no improvement on placebo in the studies I've read.
Whereas, higher doses are _hugely_ better than placebo, especially for anxiety.
What's worse is a lot/most studies on SSRIs in general often don't adjust for dose. Which seems like an enormous oversight to me.