I think one of the issues is that often when it comes to depression treatment precedes diagnosis, and treatments affecting the symptoms can make the diagnosis even more difficult.
People going to their GP with a 'I feel depressed' that get told 'well, here's a prescription for some pills, let me know if you feel better with them if not I can give you something else to try' would be the same as if somebody reports a thorny concurrency bug with your embedded multithreaded application and your first response is 'well, let's try to overclock/underclock the CPU to see if it improves things, if not maybe we can try to change the RAM next time'.
It is a lot cheaper for medical services as a whole to have GPs easily prescribe antidepressants and psychoactive drugs in general rather than have psychologists available immediately for anybody who might need them, but it does not make it right.
Others might not share my misgivings but I would only be willing being prescribed a psychoactive drug by a specialist (psychologist/psychiatrist) after a thorough evaluation and non-pharmacological therapy first, and even then very conservatively and after an explanation more objective than "you have a chemical imbalance in your brain" (which chemicals? what imbalance? what should be the normal values?).
There should be much easier and cheaper access to non-pharmacological treatment for mental issues, but maybe to have that one would need it to be destigmatized, which of course is a very slow process and might or might not be possible due to the identification we have with our minds: if our knee hurts we think "my knee hurts, it needs fixing" if our mind hurts we think "I feel bad, I am a worthless person" which is a lot harder to deal with unfortunately.