why always core versions

what do you expect? sd865 on a budget phone?

it's a premium feature available on higher budget phones like A and S series. Company developers work a lot on implementing them so they have to get good pay, that's why they are available only on expensive ones

this is bizznesss bro

What features do you want? Tell us exactly.

because sometimes processor or the internal hardware such as the storage or ram type is not supported. And many things if Samsung will give all premium features to all its price range then why anyone will buy note 20 or S20 instead of M31.

If You want more features then you have to choose A Series.
And Core versions will be bug free than the Original since it doesnot have many complicated Features.