> a guy basically explaining that tanks may be becoming less of a focus in modern armies, as new weapons and tactics easily counter them.

Tanks will probably reduce in focus given their massive expense vs. the countermeasures but the Russian's tank losses have arisen partly because of their massive tactical incompetence and can't in themselves be taken to mean that tanks are now useless. Tanks work best when used in combined arms ops, with supporting infantry, artillery and air.

Sending columns of tanks in single file down main roads and then getting them blown up is basically the plot of "A Bridge Too Far", a.k.a Operation Market Garden in WW2, when the Allies tried to quickly cross multiple bridges into Germany, and discovered the hard way that only the tanks at the front can actually fight, and that if they get stuck, so do all of the others. Obviously the Russian commanders didn't watch this classic film when it was repeated on Sunday afternoon TV.

[Edit] That said, I wouldn't necessarily choose AFV crew if I was picking a job in an Army.