Should we have or avoiding having a Task Board?
Generally we track progress of the Sprint on a Scrum board.
We create cards for each User Story and move them across the value stream mapped on the board.
However, most of the times the Sprint has less than 5-7 User Stories that move more or less together on the board.
So, there is little insight which we get from the progress just by looking at User Stories card.
Since we add Tasks against each User Story that gets worked on by multiple team members, we thought it would be a good idea to create a Task Board.
However, we also doubt that the Task Board may get interpreted as way to represent progress purely based on the number of Tasks that are Pending, In-Progress, Closed. This will also lead to team member specific questoins that didn't arise until now on why certain Tasks are in a specific state rather the progress being reported.
Should we discard this idea and really only on the Burndown Chart or should we have a Task Board. Please suggest what is the most suitable approach by Scrum methodology.
Scrum guide doesn't talk about Scrum board or a task board so you might not find any one recommended technique, there are zilllion and it depends on what suits you.
I see you have loads of doubt on a practice that the team has decided that might work for them, why don't you give it a try and assert all your assumptions ? if it doesn't workout then change it and that's what Scrum guide does say, inspect and adapt.
This will also lead to team member specific questoins that didn't arise until now on why certain Tasks are in a specific state rather the progress being reported.
Don't you think this will help create transparency ?
While there are many ways to raise the transparency during the sprint and inspect the progress towards the goal, chose the one what the development team decides, inspect and adapt as the product development emerge. Scrum framework does not recommend or prescribe a single practice to do this while there are many practices available as one size can't fit all.