There is something to be said about having a 'slight' image from outside sometimes inducing vertigo. That would be the only good reason to get some of that experience, however...
I have observed instrument pilots who have always gotten some outside 'help' during the instrument training, and when they put a full hood on, they are pretty shakey. That may be a contributing factor in why real IMC is so different.
Even when you have on a full hood, the movement of sunlight on the panel will give subliminal clues that some axies is changing, ie., a slight (1 degree) heading change, a slight roll, any relative movement of the airplane will display a shadow or sunlight movement on the panel, which causes you to increase your scan to discover what caused the movement.
It is hard to get a lot of actual, but you can do better by using a full hood under overcast skies so that you don't get the sunlight movement.