think you have missed my point.... the point is they have put the effort it is so that TCs don't work with 3rd party lenses.
if you take Sony body out of the equation there is no issue as shown in the video shared. So I am asking them stop putting in any more effort to purposely/deliberately get in the way.
Whether AF, IBIS and whatever else works appropriately with 3rd parties is hardly something they'd care about or need to care about.
Manufacturers never take responsibility for performance or issues with 3rd parties.
I remember when there was an issue with A1's IBIS on the initial lot that shipped, I was asked to send example of the issue only with 1st party lens. They didn't care if it didn't work with 3rd party lenses.
So what i am proposing should be less work for them