ATGMs are single-shot and 50lbs. They're hard to carry around the battlefield, and the people carrying them aren't carrying much else.
Furthermore: Tanks provide 40+ shots upon their call, and tanks easily maneuver around the battlefield at 30mph or faster.
Finally, Tanks have 3000m to 4000m range. Javelin only has 3000m range, while NLAW only has 1000m range. The tank is faster, the tank is more maneuverable, the tank is better armored, the tank has more range, the tank has more bullets, the tank has bigger shots (120mm rounds blow a bigger hole in the enemy than Javelins do). When the tank fires, their shells travel at literally hypersonic (Mach5) speeds. There's various stories of how tank-commanders saw an enemy's ATGM, fires back with the main cannon, and pops their thermal-smoke grenades to avoid the missile.
At 2000m or 3000m range, its really hard to actually fight a competent tank crew. Even if you are provided with the best of the best weapons (an NLAW is fully outranged and outgunned)
To carry similar firepower to a tank, you'll need 40 troops, each carrying a 50lb Javelin into the battlefield. Sure, the tank can die to one Javelin, but your 40 troops can all die to a few 152mm shells... and troops don't have the luxury of sitting in a vehicle (troops carrying 50lb weapons move slower than the armored cars we call "tanks"). Nor do they have immunity to sniper rifles or machine gun fire.
And once you have those troops in position, there's still the problem of the innate slowness of the ATGMs compared to tank APFSDS / HE-frag rounds. Yes, rockets are fast, but tank-rounds are far far faster.
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No one can deny the shear offensive prowess of the tank on the modern battlefield. ATGMs are very good tools as well, but even they pale compared to a tank APFSDS round or HE-frag round from a tank.
Now those benefits are negated in urban environments. Close quarters combat, within 500m or 200m is common, as ambushes can be setup anywhere. But still, the tank's role is needed in these urban environments. The 120mm tank gun is the only weapon that can repeatedly blow up squads who are hiding inside of a house for example. (It'd be too expensive to use ATGMs vs a house, but its not that expensive to use tank HE-frag or APFSDS rounds).