Building permit for other windows with developer

No, he now has two singles. They could have been connected to a sliding door, but he now wants a double wing door. So both singles pushed together. Right?

Yes, but HS should be possible and DF not. In my opinion, there is no fact-based argumentation for that. Unless you take "no desire" as a fact.

Thank you for your assessment and considerations.

As mentioned above, the sliding door is available as a special request. The alternative double door is not.
The arguments of the developer were the ones mentioned.

I also suspect rather "no desire" as the main reason.