In case I was not clear I believe the tank is very far from dead and was trying to make that point.
Below is a very interesting link from the recent UK Royal United Services Institute conference (one of many interesting talks from this conference) I direct readers to the second speaker from 22 minutes in.
https://www.youtube.com/watch?v=tIg3LkAYNKM
He is talking about current war in Ukraine and Russian forces.
Lots of tanks, lots and lots of powerful artillery,
very effective area air denial via SAMS, etc, trenches, and a lot of electronic warfare/jamming too.
The Russians have always been an Artillery army, it was their best arm even as far back as the Napoleonic era. In munitions terms whereas the West has gone increasingly precision, the Russians have gone for mass effect.
The Area air denial -if it works against the latest Western aircraft- really would be a game changer, since I strongly suspect Western forces will suffer more from the loss of air support than Russian style forces would, especially in the face of a very powerful enemy artillery.
From a British Army point of view I would say the lesson would be don't, under almost any circumstances, be fighting Russia in Eastern Europe, as a single Armoured Division (and that is the most UK is going to be able to generate for the foreseeable future) however well equipped and trained, is pretty much useless for that type of warfare in that type of theatre. Although, of course, it might be very useful indeed, elsewhere.