Features that I'd love: WhatsApp Task List

I use WhatsApp a lot! In a recent frustrated experience to organize a barbecue with friends, I realised how I miss a shared task list in it.

I mocked up this feature and shared with some friends to hear their impressions. It was super positive: they loved and also would love to see this idea coming true.

What do you thing about it? Would it be useful? Feedback is super welcome :)

Part of the flow is here https://dribbble.com/shots/11531897-Features-that-I-d-love-WhatsApp-Task-List-Flow