Some discussion of pharma-psychiatry stuff, i haven't gone through to verify claims (whether it's some crank journals), but the gist is that antidepressants show effectiveness around placebo for depression treatment, and thus not getting success from them and getting approved for ketamine shouldn't inspire confidence, as it shows the same effectiveness.
(obviously not a call to abandon medication if it helps you, who it helps - it helps)
https://pmc.ncbi.nlm.nih.gov/articles/PMC11271411/
This study shows twice weekly oral ketamine to be superior to placebo.
https://jamanetwork.com/journals/jamapsychiatry/fullarticle/2735111
I believe this shows the same thing for twice monthly esketamine nasal spray
Aside from declared conflict of interest. the first one do be showing some improvement only on 180 mg dose i think, 20% remission vs 35%, which is significant mind you, but not one shot wonder