It is very worthwhile putting on trim tabs. Adding side tabs is useful but you can make those adjustments easily by moving people or weight side to side in the boat. The reason you don't want them is that they can negatively affect the shape of the wake from side to side. The reason you do want side trim tabs is for surfing to add list, and so that you don't have to move people around in the boat. If you get dual tabs on the sides make sure they operate independently so you could put both up or both down.
My opinion is that the center tab is the most important. it has the best ability to adjust the attitude of the hull to handle varied conditions. A sterndrive or outboard does this easily so they add side tabs. An inboard has no way to adjust this. You need to change the attitude of the hull (bow up, bow down) to make starts easier and more efficient, to optimize cruise speed and fuel use, and to set the boat for driving in large waves or a storm. (Bow down into the waves, bow up following the waves). The safety factor in a storm is the reason I will not own a boat without an adjustable trim setting.
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