You're right that Meals You Love integrates with Instacart and Kroger for ordering meal plan groceries but it's not primarily a grocery funnel and this has no impact on meal plan construction. Really these are just value-add integrations IMO. For our family, the real value is actually providing a means for us to save our favorite recipes and get AI-recommended recipes peppered in. The grocery ordering is secondary, though quite useful for us.

The second big value prop for us has actually been the new "Quick Bites" feature which generates recipes based on ingredients you have on hand (either tracked in your pantry in the app or simply input manually). For instance, we'll often have some ingredients we want to use up but need suggestions on what to make. In this case, there's no grocery integration at all since we're using entirely stuff we already have.

Good question on the meal calendar. You CAN share meal plans (as well as recipes), though there isn't a calendar as such beyond the weekly meal plan view.

Preferences are primarily handled via the AI (uses Gemini on the backend) and this is the primary driver in how recipes are constructed and recommended.