Using autofill or robo is acceptable. Read thru (as Sacred suggested) and you will see we have repeatedly participated in some lengthy posts regarding autofill and roboform. Mr. S. says it is fine to use both and he never gives us bad advice.
I have won some nice prizes (including some big sweeps) using autofill.
And the Grinch, with his Grinch-feet ice cold in the snow, stood puzzling and puzzling, how could it be so? It came without ribbons. It came without tags. It came without packages, boxes or bags. And he puzzled and puzzled 'till his puzzler was sore. Then the Grinch thought of something he hadn't before. What if Christmas, he thought, doesn't come from a store. What if Christmas, perhaps, means a little bit more. - Dr. Seuss
May the Joy and the Meaning of the Christmas Season fill your hearts throughout the year.