Reviewing arguments on both sides. I know that I have a bias. Personally, I believe on the development of calculation and sight analysis. My opponents are playing my at my very worst or best. I'm just waking, or sleepy. I could've had some drinks, or a headache. Am I sipping coffee, or am I on a runner's high after a morning jog.. When I have the feeling I've played someone and they may have used the "tool", I feel cheated. As if we were never on the same footing... I do get the logic, I understand it's considered fair play by the website... Still, I play on another app where you can offer your challenges sans the "tool", and there at least to a degree I feel well playing a fair one... But my standards...
What say you??
https://www.chess.com/forum/view/general/using-an-analysis-board-during-turn-based-games-good-or-bad