C'mon Zn.
You don't have to know the details to know that the Rams have a set of terms in mind and the AD side has a set of terms in mind and they don't agree on key issues (key to both sides). That much of it is not a matter of who's right and who's wrong.
The only right and wrong in this situation is who is abiding by the contract and who is not. AD is not.
The Rams absolutely do NOT owe AD a new deal legally, ethically, or morally. It is entirely optional on their part; a new deal is a reward only and only works for the Rams if they get something they want out it; keeping Donald (guaranteed) long term at price and terms that doesn't wreck the cap or the structure of contracts. AD doesn't have a new deal coming for 2 more seasons. He just wants one.
So exactly what the points of impass are, are irrelevant. And as you have said, are unknown to us. But they are such that the Rams don't appear to be budging from what they have offered, and AD's side is indicating that they will continue to not honor the current contract until they get whatever it is that they want.
From a negotiating standpoint, the Rams need to give them their last and best offer, with a deadline (no offer should ever be open ended, too much can change and it gives one side too much power), and then move on. No more talking. I suspect that if what has been reported that the Rams brass actually did fly to meet face to face with ADs agents, that is precisely what transpired to make it crystal clear that they bring with them the last best offer. Take it or leave it.
If not, it is very foolish negotiation on the Rams part. And I don't think they are foolish negotiators. We can argue with whatever money and terms they have decided not to exceed. But negotiation techniques are well understood and each step has meaning.