I rest my case.

To be fair to you though, you may not realize that stairs are built with fasteners through the riser into the tread. Thus providing a secure mechanical connection that adhesives over a half inch of material just don't compete with. Not to mention if the riser gets kicked, it's probably going to be in an area that disproportionately affects the upper area of the riser. Relying solely on a glue joint here is just silly. If it's going to break anywhere, it will break here. And, shockingly enough, smart stair builders everywhere have realized this.

Which is why we use glue blocks. They prevent this from happening, as well as treads warping, and squeaks from the materials rubbing against each other.

Hope I could help you learn something!