You can fire roughly 50 javeline towards T90,still it will be a cheaper option than T90. Now do the cost analysis of top end tanks like lecrec or Abram, against a tank with active protection system that difference will further balloons.
Refrence:- US and allied advance against Saddam forces.
A solid armour formation is extremely effective. Those 100 soldiers will be mushed to death before they get anywhere near to even setting up their atgms.
Tanks never work alone.
Rocket artillery in rear, attack helicopter in air, ifv & apc supporting the armour thrust and mobile vshorads. This is the failure on the part of both Ukraine and Russia that they haven't been able to put it together.
But if tomorrow USA launches a conventional thrust, tanks will be the center of it.