Time-restricted eating (just like any other dietary approach) seems to me to have major benefits because it often leads to weight loss. Naude et al. (2014) estimated in their meta-analysis that most, if not all, health benefits happen simply due to the lost weight itself rather than the diet type.
So, you said it very well — sustainability is the name of the game. All diets will lead to equal health benefits (assuming equal weight loss) so you might as well choose the one you can adhere to long-term.