Hey @KyleG-Shopify, thank you for the response.
While I’m aware the correct way would be creating the app in my own partner account, in this case the store owner requires ownership of the custom application. To me it would make more sense if partners could access the Dev Dashboard once granted the required roles, as it would improve the DX greatly for those use cases. As mentioned in the post linked by you above, this only forces the business owner to either administrate the developer account (which is definitely not optimal since most business owners aren’t technical) or to add devlopers as staff. Previously application development could be done using roles as a collaborator, however now it seems like that is no longer the case.