That suggest that "modern" main battle tanks are not designed for muddy places like The Netherlands or South East Asia but specifically for deserts as in the Middle East. That is an interesting strategic choise.
The modern main battle tank was designed to fight across the open fields of a irradiated Germany. It's a product of both the second world war and the cold war.
Lets go back to its origin story.
After the end of the first world war, two schools of tank thought predominated. The French school viewed the tanks as merely infantry support. The British school saw them as armored cavalry. In particular the theory's of then col. John Frederick Charles Fuller a British military officer and mystic who along with his military treatments wrote essays on Alistair Crowley and Yoga. Fullers works became heavily influential among both the British and the Germans. The results of these were the Tank class system of WW2
The light tank or Tanketts were high speed low drag machine guns with light cannon.
The heavy tanks were slow monsters with massive cannon and armor.
When the war started though it quickly became apparent that the WW1 fortified warfare was long over. Advances punched through so fast that the light tanks were dealing with the heavyweights far sooner then they would have liked and the heavy tanks meant to take heavy tanks were lumbering way behind the scene.
This created the medium tank. If a light is to light and a heavy to heavy this is the Goldie locks. They took a good enough gun mated it to a good enough engine and topped it with a fair armor. The key failing of the period was power. Engines of the time were not up to producing a tank that had the optimum performance armor, firepower and maneuver. By the end of the war Medium tanks are the rule of battle. Although there would remain heavy and even super heavy tanks less and less were they actually used. The first main battle tank comes from the British. Taking Fuller to heart. And following late war innovations by 1945 the British developed the then called Universal tank. This tank took a top gun mated to a powerful engine and placed it in a well protected hull they dubbed it the Centurion. They called it universal as it could support infantry, charge and take on other tanks. It was not until the mid 50s that the US and USSR would adopt there own as both sides were fully stocked with WW2 leftovers.
When they did adopt them both sides modeled there battles across open Europe they set to proving grounds in such terrain. East and west Germany. From time to time the brush fire wars would pop up. In Europe when Republiks of the USSR and Warsaw pact tried to break away the Russians were quick with the tanks. And they evolved there own unique form. Russian tanks aimed to be small but powerful. They also introduced the IFV well the west was using poorly armed armored boxes.
Vietnam for the US was not a armored war. Although there were some armored battles the US command felt that Full MBTs would be more trouble than worth, they also had little in the way of a actual tank battle to worry about and were more concerned with trying to fight a insurgency. The tactics adopted by the US made Vietnam the Helicopter war. With the Huey, Cobra, Jolly Green Giants, Loach, Dog and other choppers taking the fame. The thick jungle, mountains and mud were seen and still are as unsuitable to armored mechanized war which favors open flat terrain.