Prudence, non all Buddhists believe in karma. There are many variations of the philosophy, some of which are entirely secular, and have been for centuries.
The studies I’ve read do not support the idea that what’s healthy is belief in things that likely don’t exist. What’s healthy is being part of a community, having purpose, and so on. The sort of spirituality that Chopra peddles is not needed.
You think ethics and the well being of humanity is not good enough? Why? Also, who said that secular spirituality is limited to that? Take a Carl Sagan and his idea of finding transcendence in the contemplation of nature, a notion that goes back to the Greco-Romans. Or take beauty — both natural and humanly crafted — as a source of spirituality. All of these things work for a lot of people, so, again, what Chopra proposes is not necessary.
As for New Atheism, I’ve made clear several times in my writing that I’m not one of those. They are indeed too dismissive and aggressive. But they are right. The problem is with their tone and rhetoric, not with the substance of what they are saying.
As for Stoicism, I have no difficulty dropping the Logos and updating the philosophy. I’ve done. Without much effort, I may add.