I have an algebra book on my shelf* that puts function arguments on the left, as in (x)f instead of the usual f(x). It is definitely more “natural”, as functions compose in the normal reading direction. But even so, it is increadibly hard to read, because the break with the usual convention is so radical. Needless to say, it didn’t catch on.

* In my office, but I am at home. Don’t remember the author; sorry. But it was written back in the ‘60s, I think.