A lot of the hubris and ignorance stems from people not realizing Iran is basically the size of Western Europe, but pretty much all mountains, with a population almost 1/3rd that of the US. The map distortions from Mercator projection really warped people's minds and perceptions.
They also seriously underestimate what Iran actually
is at a structural level.
Instead, they still picture it as some backward Islamic barbarian state, when in reality it is in the top 10 countries in the world for yearly STEM graduates and has far more industrial power than people like to admit.
For example, Iran’s total electricity demand is around 50 times larger than Afghanistan’s, and that is after the war in AFG.
That alone should tell you the difference in scale by extension as a proxy.
And Afghanistan was the country where the US got bogged down for 20 years and still lost, despite the similar terrain, while Afghanistan had basically no serious ability to strike back and no ability to choke Hormuz.
Iran is also one of the top 10 steel producers in the world.
Afghanistan does not even produce any meaningful amount of steel.
Iran is a completely different level of problem.
There is no way the US, in its current condition across the board, survives a prolonged conflict with Iran.
I swear, some people, even here, are mentally still living 30 years in the past.