Why dont we conduct this practice anymore? Do we still have any churches that do this?
We stopped some time early in the 2nd millennium because a heresy started spreading that said the body and blood were separate and thus not both present under both species.
Yeah. And then reintroduced it more recently to combat clericalism.
And now we have the opposite problem of anticlericalism or layism running rampant
Indeed. We always manage to screw up in one direction or another.