Thank you for the feedback! This is right, github is a platform for devs mainly and if a team has non-dev people involved in the project it might be a strong reason for choosing Trello.
I've never heard about quire.io, it's time to check it out...
It is relatively young in terms of duration and they are very open to feedback. So I could achieve through my feedback that they allow and display checkboxes for the descriptions of the tasks as markdowns. And this within a few days.
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