Well I guess sarcasm is lost on the wary - like myself. Blame admitted. I will also blame it on the times we live in.
How will you improve ERA when the latest Russian ATGM's have tandem explosive-warheads? The first defeats the ERA and the second following immediately after pierces armor and explodes inside the tank.
Bar armor helps some - but not a whole lot. Tanks are increasingly a losing proposition as anti-tank munitions improve and become smarter (and cheaper to boot).
You can fire a KORNET ATGM mounted on a cheap pickup with Tandem warheads and blow the turret off of an Arjun (ERA will not help), cook off the ammunition inside and spend only a fraction (if that) for the ATGM cost spent. And no personnel lost who fire the ATGM.
The Arjun will have cost $8 million to buy (probably more for the 2nd version) and there will be at least three trained crews lost inside the tank.
Better I think for both Pakistan and Bangladesh to concentrate on developing advanced ATGM's from both a strategic and financial point of view. We have some METIS M-1's now - don't remember if we have KORNETs.
@Ronin bhai will have better information.