We can do templating on SharePoint, through Site Designs and Site Scripts. We now also have the option to "Create a Microsoft Teams from Template".
Unfortunately, both do not work together. We either have a templated SharePoint site with a generic Teams or a templated Teams with generic SharePoint site.

I would love the possibility to combine both templating options. Preferrably with an API from day 1.
This would give us an end to end templating scenario, where we can create preconfigured Teams with a preconfigured SharePoint site. (In the future, hopefully with a preconfigured Planner etc as well ;) ).