Thank you for your continued feedback. The feature team is reviewing this ask and working on a solution for team templates without content, as well as considering ways to create teams from template with content (i.e. files, etc.). We will share an update as soon as one is available.
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make sure it includes any MS planner / Power apps that were created in the team as well (including all their settings / details)
Removing the Conversation Tab is being reviewed by the feature team.
For deleting chat messages, please following progress here: https://microsoftteams.uservoice.com/forums/555103/suggestions/33535006.