Logging food in fridge+getting food suggestions based on macros left+tags for food like slow carbs

No, MFP doesn't have those features.

If you think it should, post in this area:

https://community.myfitnesspal.com/en/categories/feature-suggestions-and-ideas

Here, you're just talking to other regular MFP users with no more power or influence than you have yourself.

The MFP staff doesn't read every post in the whole Community. There are too many. They read posts in the section I linked above.