My understanding is that version 2.0 Impossible film (as marked on the box) does not require the film to be ejected into a dark box and remain there during development (30 min.?).
For film not designated 2.0, I don't know if there were different batches - some which were more problematic than others.
I just grab the print and put it in a pocket or other dark place as soon as it comes out. I've not really had much problem (though am using SX-70, which is the slower film). As long as you're not in strong sunlight it should be okay. I've had more issues playing with the exposure adjustment so as to not over-expose the film.
Some people were saving the dark slide that ejects when you first put the pack in, and wedging it in as you would a frog tongue. I've not tried this, so don't know if it will work.
In all likelihood you will be using 2.0 or newer film, so you don't have to worry about it. However, in really bright light you still may want to shield it when it is first ejected.
That said, I still use a frog tongue, because I still have some older film stock that I'm shooting with.
Aside from any light shielding function, the Impossible frog tongue neatly catches and holds the ejected print, preventing it from falling to the ground. The original Polaroid tongues aren't long enough to do that.
Every Polaroid integral camera I've ever used (SX-70, SLR690, Image1200) has ejected the film but retained the end of it between the rollers so it doesn't fall to the ground.
After the shot, I just put the photo in my shirt pocket. I've never taken multiple shots without doing that, maybe that causes them to fall?
You can have the film eject into the box that the film came in. This is what I did for the cameras that did not have Frog Tongues. The SX70 frog tongue is less than ideal and stays out all the time, where the Spectra rolls back into the camera out of the way.