In the (oldish?) documentation on themes, it is noted that it is possible to have multiple themes (in some order) and Hugo has a way of consolidating content from the different theme definitions. Of course, the user needs to figure out if this makes sense etc.
However, with the new modules approach, it is not entirely clear to me if this still applies. I have tried adding multiple modules (using the [module] tag more than once) to a site, but I get the error that the tag has already been defined.
Any pointers on whether multiple module support is intended or whether there has been convergence on the use of a single theme (and hence only a single module should be required) as the standard approach.