All lowercase?

[tenienteramires]

Is it acceptable to write Latin using only lowercase letters? As far as I know, it was common in the middle ages, since lowercase letters are actually calligraphical variations of uppercase. Have you ever seen a text in Latin written in "all lowercase"? gratias uobis ago

 

[Agró]

Yes. I’ ve got one, this.
It would be hard to read if it were printed all uppercase.

EDIT Proper names are written uppercase, if I recall correctly.