If you are comfortable with MF and have a good eye, I don't see any reason for you not to focus manually.
At my age and with my poor eyesight... I wear glasses and don't wear them while shooting... AF works fine for me for most of my shots. If I feel the lens hunting, then I switch to MF.
While it is fine to continue shooting in MF, it dosen't hurt to tryout AF.
BTW, what is your shooting gear?