I agree, the panels are really unwieldy and are just not easy to use at all compared to the tabs.
Also, right now with this new approach, things like adding a new tab to the admin page that used to be done with HandleEvent(AdminTabStripCreated eventMessage) don't work any longer.
How do we add a panel to this for example
I am not too worried about adding new panels as I am sure the nopCommerce team will provide a way to do so.
I am worried more about the User Experience.
I have a lot of experience working with nopCommece and even I am a bit confused with the navigation through the panels.
Imagine if you are NEW to nopCommerce I am sure that you will be completely lost.
p.s: Andrei please don't compare nopCommerce with some inferior and dying frameworks like Magento and Volusion :)))
I don't think Magento has made any changes to their administration in the last couple of years.
Actually Shopify don't have neither Tabs nor Panels. They have more "like" Tabs interface i.e managing Product Variants and navigating through the variants.