Is it possible to use different styles in different groups or components in the same drawing?
Not in the same scene. You can use different styles in different scenes but only one style can be used at a time. When I want to show different styles in different parts of the same view, I combine image exports externally.
Another workaround is to overlay scenes with different visible parts and styles in LayOut
Yes. That’s true. I frequently want more control over the individual images than I get with LayOut. I do use stacked viewports in LO frequently for showing various line weights or creating cut-away views. Both are useful methods to know.