“Biden advisers have told Axios they’re concerned that videos of Biden walking and shuffling alone — especially across the grass — have highlighted his age.“
“..Why, WE CAN’T have the American people seeing the truth!!! It’s all about deception!! THAT is the DC way!!..”
For the entire thirteen year or so of the FDR Presidency, the fact that the President was confined to a wheel chair was never revealed
I would suggest that the real reason is to prevent him from falling.
Situational awareness by one who’s mind wanders can disappear if other things come to mind. By not paying attention to walking, a misstep and then a fall can easily occur.