I think at one level, the IA has made the Arjun (and the MKII) into an equivalent of what the British termed breakthrough tanks. They would be the ones clearing through enemy fortifications and minefields (thus the mine plough), taking the brunt of enemy anti tank defences and tanks, while the T-90s flank around, make hit and run attacks... etc etc. And I believe that this came about after the comparative trials between the two tanks.
I could be completely wrong and the IA might just be dragging its feet, but seems unlikely...
Well your completely here mate, Arjun is not a break through tank. Employment of Tanks T90 or Arjun in our context is primarily
1. Lean on Operations on Enemy Ditch cum bunds
2. Break out and contacting enemy on its second Ditch cum bund using their own bridges, now lets see why the Army is not Pro for Arjun.
1. If you induct a 70 Ton Tank you will have to change the complete equipment profile of Assault Engineer Regiments, Their Armour ed recovery vehicles, Bridge laying tanks and other maint equipment.
2. The entire change in the inventory will require ,Huge amount of money and time. Do we have the time and money at this stage ?? well i leave it for you to decide.
Arjun is my favourite Tank i have been lucky enough to have seen this beast from close and go through all the incorporated changes which really makes it world class. What DRDO really need to DO at this stage would be to make a FMBT with weight under the domain and Tech incorporating all what Arjun Mk 2 has.
And for Gods sake pls stop abusing the Army, yes they have made mistakes but they are no fools to invest in a machine which will not fetch them victory in WAR.