i think it’s better you just try it out at hand then make assumptions over the aspects of downgrading simply to what you’re used to and getting more better detail over what you can actually do with no issue

1440p for competitive is fine, if people can game on CRTs at 480p and still get to the objective I see no problem for the higher level

i haven’t looked much into coolers a lot but I’ve heard good about this

https://www.amazon.com/dp/B0C76XLPCW

yes

could be put under a specified tdp by the manufacturer in the laptop so it only goes to a certain withhold of power

either that or it’s thermal throttling