YOu ask it to be kept simple and then come up with this
I came up with something which is battle proven, read 1965 and 1971 skirmishes, also which is taught in Infantry School, Quetta and Armour School, Nowshera. Furthermore, the mechanised infantry concept is also based on this, as Pakistan's Infantry to Armor ratio is very high, which means very less tanks compared to Infantry formations.
Previously the armored doctrine was to advance blindly on enemy positions and the most experienced tank crew after Tank commander was the driver, so much so that many times the knocked out Pakistani tanks were found atop or near enemy bunkers since the driver was taught to charge on enemy positions with or without guns blazing.
Base line: Its not wise to send in tanks upfront when the position is known to be defended by enemy ATGM teams. Tanks are used in maximum effect by advancing through enemy weak points, flanking enemy positions and thus causing chaos in enemy lines forcing enemy to retreat.
That is MAJOR fire power sir, committing heavy resources to the strike corps. Moving the artillery along with the advancing strike forces and then spending resources to avoid sabotage attacks on these forces. Plus the infantry forces that will need to advance on to enemy ATGM position (and mind you, these wont be fixed position and many will be infantry men carrying shoulder fired ATGM) will face heavy causalities due to enemy fire and because of lack of cavalry support (the enemy will have tanks in their ranks). Sorry but this seems too much of a daring operation and if it goes wrong, then first you lose your infantry attacking enemy without heavy cavalry and then risk the heavy cavalry as well.
The enemy positions will become fixed when artillery starts raining shells, as it forces enemy to take cover apart from pinning down the enemy, this is a major benefit of pre-attack bombardment. When the bombardment stops and the enemy comes out of cover, own infantry will pick mobile targets very quickly, movement attracts eye- it cant be ignored and where the eye goes, the muzzle points, so enemy will prefer to remain safe and protected in fixed positions. If Tanks are sent in to attack a position defended by enemy infantry, ATGM , armor and artillery, the risk of losing tanks is 50%. If the tanks are sent in to attack the enemy from a position cleared by infantry forming a hole in enemy lines, the risk of losing tanks is 20%.
Another major point, dismounted infantry on foot when charging a position slows down tank advance too. If tanks advance ahead due to speed and mobility factor, they lose infantry cover. If they move along with infantry, they will be slow moving targets keeping pace with infantry and taken out by enemy ATGM teams from a decent distance.
Main point, Coming onto enemy positions, tanks will face two major threats, ATGM team and enemy Tanks. If the tanks start to take out ATGM team, the enemy tanks will target and destroy own tanks and vice verca.
If own infantry takes out at least the ATGM teams, the chances of survival of own tanks will increase and only enemy tanks will be left to counter.
Last point, Tanks have a main gun, a HMG and a 7.62mm gun usually, all require line of sight for taking out target. Infantry has assault rifles, LMG's, grenades, bazooka, ATGM, mortar etc, more hands and more weapons., not all require LOS. Like you pointed out, the defended position has ATGM, tanks and prepared positions as well as mobile assets.
If tanks are sent in with infantry, enemy will find tanks as bigger and primary targets, and will take them out first, ignoring infantry. The tank has been set to fail.
However, if infantry is sent in after artillery bombardment, the array of weapons the infantry has, will keep enemy engaged with them. Infantry can crawl and conceal, more survival factor for infantry, tanks cannot. Constant firing by 100's of weapons of own infantry, will have mowed down or forced enemy mobile forces to take cover, rendering them useless. Infantry can keep enemy occupied and engaged from concealed positions, then start reporting weak points for tanks to enter and advance fast, quick, guns blazing and flank the enemy. This will make two directions of attack instead of one. Now when the tanks roll-in, the pressure lifts off infantry and enemy focus will be shifted in two directions. Imagine the psychological effect on enemy now, this is shock and awe created by tanks.
The trap set by enemy to ensnare own Tanks into prepared ATGM positions has been thwarted.
The best solution is flying tanks.... Gunships with amazing fire power. Like most ships and destroyers have abandoned Canon as the primary weapon likewise 3000 or 4000 tanks inventory can be replaced with 1000 or less gunships with the combination of LFVs on ground. Tanks are becoming more and more sitting ducks.
what about SAM threat. Check the amount and types of Russian SAM systems devised to engage NATO air power.