[No Demo Store] Can't delete product type

actually "Can't delete product type" it's not a bug.
it's Commerce Features "Feature": The product types provided by (Commerce) Features shall not be deleted.
at this moment you can still see the delete button. but probably soon it should be vanished #1781312-3: Remove delete buttons for enabled "Commerce Features"
here is a commit which includes the Commerce Features patch: https://code.drupalcommerce.org/#/c/429/

So what you have to do it's to disable the custom Feature that defines this product type:
- for [No Demo Store] Commerce Kickstart Lite Product
- for [Demo Store] Commerce Kickstart Product

Fixed by the provided commerce_features patch.

While trying to delete one of these features these error messages shows up:

The feature commerce_kickstart_lite_product cannot be enabled because it conflicts with commerce_kickstart_product.

or

The feature commerce_kickstart_lite_product cannot be enabled because it conflicts with commerce_kickstart_product.

The patch only disables the buttons, it does'nt change the possibilty to delete product typs. Right?

If you're just trying to disable a feature, why does your error message say you're enabling the opposite one?

Yes, it just disables the buttons.
I will untie the product type in "no demo store" so that it can be deleted, but the demo store ones won't ever be deletable.

If you're just trying to disable a feature, why does your error message say you're enabling the opposite one?

That's what I'm asking and don't understand.

I'm trying to delete the default Product Display Content type, since I won't be using the plain Product variation type provided in DCK. However it does not appear to be removable (While I was able to delete the Product variation type)...

Let me see my solution of problem, it's work for module Drupal Commerce !

1. Go to Store
2. Click Orders
3. Chose Shopping carts
4. Delete all orders in there
5. Go back to product's and delete all !
6. Then delete Product Display Content type !