Your post regarding an air cooler dissipating 350watt is nonsense. Dual 120mm radiators with decent fans of 1500-1800rpm would dissipate up to 300w. I am not sure where you're pulling your magical unicorn numbers from. Feel free to post a air cooler that can dissipate 350watts, make sure it doesn't have 5000rpm fans attached to it.
I just need to quote this to show you don't know what you're talking about and you're not worth arguing with.
Get off your high horse. Hard to argue something you can't prove.
You took the time to write horse manure instead of list a name of a product, so the only waste of time here is you. Dodge more when someone questions your opinion because you can't provide facts to prove it.
You are claiming a "high end" air cooler can dissipate 350watts of heat. Do you have a name for one? Sorry you don't. The high end air coolers you mention cost the same as closed loop coolers. The closed loop coolers dissipate more watts of heat than the air coolers. When it comes to surface area, air and water, ambient temperature water flowing through a radiator with fans blowing through the radiator fins will dissipate more than the same surface area of heatsink with just air blowing on the fins.
Again, feel free to prove yourself, because it would of took less words to type the model of this "high end air cooler". You could have saved everyone the time and just listed the name of this unicorn air cooler.
IMO the only fan/heatsink coolers that can handle such wattage are massive monstrosities that almost certainly cannot be shipped mounted or they will snap the PCB/mounts, and would require a big open case to offer the airflow. Closed-loop liquid cooling seems like the obvious winner