@Friendsmilingwidely I am sorry to hear this.* *DD had deliberately chosen an less popular deanery. I think it was a post lockdown thing. She wanted somewhere different from her native London, and so picked somewhere a close friend was from.
She loves it there and wants to stay. The only issue being that having dropped merit from the allocations process, it comes back full force when applying for training. Here you are competing against world wide competition for a relatively very small numbers of places, and so where you need a very full CV. (It never ends.) London rotations are better equipped to support F1/F2s in this than over stretched health services in out of the way places.
DD then heard of a couple the following year who were, unhappily, allocated this deanery. She was in touch with one who was a couple of years below her at her school and then met up with her.This girl and three others in the same position had met up, presumably online, and were sharing a house together and thriving.
Most others went to the local medical school, so I think DD would have found it harder had she not known someone at the start. As it was her first placement group got on really well and still socialise together, but this may not always be the case. I assume your DS will know about forums where potential F1s can meet up. If not I can ask.
Where I think the bigger impact of the new system might be is that in the past there was a big silver lining in choosing an unpopular deanery with good points as it more or less guaranteed you one of your top choices in rotations. It has meant that DD has had some demanding jobs which have helped her nail down the area she wants to go into. Under the new system I wonder what happens. I assume in the past, the same rotations, more or less, went to those who had scored in the bottom 10% nationally and over time jobs and support had been adapted accordingly. With random allocation, the same organic fit won't be there.