Dawn theme - edit blocks/sections or create new?

Hi,

Just looking at porting an old Shopify theme to use Dawn 2.0 as the base.

Just wondering about how safe/future proof it is to edit sections/blocks within Dawn?

For example, the image banner is great, but the heading is always an h2 tag. I’d like it to be an H1, or even be selectable.

What’s the best way to do this? Is it better to add/edit the existing image banner section? Or is it better to create a custom block for this?

I don;t want to get in a position where the Dawn theme cannot update due to customisations, similarly I don’t want to have to create multiple new sections