The video pretty much says “use detergent in both pre-wash and wash receptacles”. Using the pods makes this hard. Using powder lets you do this easily yourself.
That’s pretty much it.
Also, the prewash happens in a cycle, where the soap holder isn’t opened.
The only time things ever come out dirty for me is when the rotor is obstructed and half the dishes don't get any water (or detergent) on them, and that's on eco mode.
Additionally, depending on the hardness of your water you may need less detergent than the tablets have in them which could leave a white residue on your dishes.
Finally, with the powdered detergent you may need to sprinkle a little in the door for a pre-rinse which you can't due with the pods. Check your washer instructions.
P.S. Never use liquid detergents.
Why not? I’ve switched from tablets to liquid detergent and it’s working out well.