I'm interested in stochastic processes and I rarely answer questions about stochastic processes on here
Most questions are (in my experience) either
a) very applied/computational.
b) tedious details about all the measure theoretic definitions of Brownian motion/Ito integral etc.
I don't want to do computational/applied stuff. I don't often like discussing all the tedious measure theory, as it is often a huge detailed mess.
Every now any then there will be a question about how to solve an SDE which is somewhat a happy medium but honestly it's not super interesting to me and can require playing around with Ito's lemma.
I think all the interesting questions from my perspective would be on mathoverflow and then I'm not quite developed enough to answer those too much. :)
I feel like it's because there's such a huge divide between computation and theory, and all the introductory theory is really tedious and often requires a much lengthier treatment than makes sense on math.SE.
Edit, this is purely anecdotal and I don't have much to back it up with but I've noticed that Europe is more interested in stochastic processes than America. I don't know why, it just seems that way. This is mostly an American site. I noticed you used << >> for quotes, so maybe your educational background is more focused on stochastic processes.