On the other hand, you may sometimes be harder to understand for non-native speakers, especially if you speak some non-mainstream dialect or pronunciation. (Even standard British, in normal speech, is probably harder for me to process than American: depends on what you've been exposed to.) Coming from some other Latin script language, you'd probably have a better feel for oddities in English pronunciation (like 'thumb', or 'pseudo', etc.) and can easier adapt some more consistent 'euro' way of pronouncing as needed. Sometimes people won't understand you otherwise.
I don't think that early induction into specific ideologies as something to be described as blanket good. This kind of monolingualism certainly hasn't helped the intellectual life of the average American or its society writ large.
I think having English as a native language actually gives us a huge advantage: we can travel to a large chunk of the world and have a pretty good chance of being understood. We can work in globally relevant jobs with no language barrier. And so on.
You're right, nothing is stopping one from learning a second language; unfortunately not only do most english speakers lack incentive, but also they lack the ability to practice in the way most other languages do. Most of the time when you run into non-native english speakers, they would rather practice their english with you, even when in their country of origin.
Additionally, there's very little lingual diversity in the US as it stands. Sure, there are plenty of spanish speakers, but early education doesn't really focus on teaching spanish with any sort of fluency as a true end-goal.
So situationally it just makes learning a second language that much more difficult. Nonetheless, I do agree with you that there are obviously huge benefits to it; the few that you mention, along with many others.
A lack of incentive is what stops most.
> we can travel to a large chunk of the world and have a pretty good chance of being understood. We can work in globally relevant jobs with no language barrier. And so on.
You described the benefit of knowing English, not being a native English speaker.
In the time I spent learning English -- which is still far from perfect, especially in spoken form -- I probably could have learned quantum physics instead. Except, I realistically couldn't have, because good textbooks on this topic do not exist in my language, I wouldn't be able to learn more online, etc.
Now imagine removing an equivalent amount of knowledge from your life -- that is the price you would have to pay for not being a native English speaker.
(The idea of Esperanto as everyone's second language is that instead of some people spending 10+ years learning the common language, and some lucky people spending 0, everyone would spend 2 years instead. Until people would hopefully realize that private languages are useless, and then it would be 0 for everyone.)
I have no idea what you're talking about. Nobody in English-speaking countries is changing the way they speak "for the purposes of internationality." And the way a bunch of languages are importing scores of English words wholesale isn't much richer in my view.
Of course, overall, this is a very slow process. People don't stop applying the rules or simplify vocabulary over night or even within the span of a couple of years, but there is growing evidence in general that the more speakers a language has, the more it tends to simplify structurally, e.g. https://royalsocietypublishing.org/doi/10.1098/rsos.181274
I can just say that if I would have been able to speak english in my teenage years it would have majorly influenced my life in a likely positive but at least more interesting direction. Sadly back then I neither had any reasonable english skills nor was I aware of how much it would help me.
Through I guess by now it has become quite obvious how use-full english is (wrt. IT/CS).
My English is at a C2 level, and as such I am able to understand and explain complex concepts with ease, however my debating and small talk skills are nowhere nears as good in English as they are in my native language. I find it much harder to convince people using English. I know that the only thing that will make it better is practice, but this takes a lot of time and effort.
Move to glasgow if you want to be able to switch into a "different" language
1. I have zero incentive to learn another language
2. I do not have a secret/family language that I can switch into for strategic purposes
3. It gets watered down for the purposes of internationality to the point that we lose even our productive affixes. We can't even create meaningful names within English anymore. It loses its richness.