I think the thread has split in two issues:
1) is the quality of the same, replaced/upgraded components deteriorated on T6.1 vs T6 ?
2) are the new features offering a better, more convenient, augmented usability.
The OP started the thread noting his impression of lower quality plastic on the dash on 6.1 vs 6. It is irrelevant if the digital cockpit offers more information, that's another topic. You could offer more technology and equal/better plastic.
Is the "cheaper" looking card door giving a better usability as it is more resistant to scratches ? if yes it could be seen as an upgrade.
The dash itself offers less usability on 6.1 vs 6 because of less storage spaces that in such vehicle is important.
The Camping Unit is definitely looking way better in the 6.1 as in the 6. But is has to work flawlessly to be better. And we have to see about its longevity and repair costs vs repairing the old CU knob.
The D mode vs S mode thread has also gained life again, yet another issue for the t6.1 as there is no S mode anymore and some users here seem not happy with how the 6.1 (down)shifts...
I do like the new doors for the wardrobe near the fridge and at the back. There it is improved quality, looks, without reducing functionality.