I am looking at the problem from a population and industry level, and so my apologies if I am not looking at it from the individual’s perspective.
The first issue which stands out to me is that the world at-large doesn’t create enough jobs in industries where highly-skilled Western educated workers can work. In fact, low-skilled Western educated workers don’t have many prospects at a global stage either. So Western-educated workers (either immigrants or citizens) are stuck in Western nations due to several factors, including pay ranges, work conditions, and quality of life reasons, like access to a clean and safe environment, or a working justice system.
The quality of life reasons and pay ranges are the main attractors for immigrants as well, which is why some nation-state economies have remittances as a key component of their GDP. On top of that, some nations have sacrificed building an education and employment infrastructure in favor of building what are essentially factories for producing workers for Western nations. This also has the side effect of keeping the quality of life of these countries suppressed because people who would voice the most discontent simply leave. So, I’d say the second reason immigration visas need a more nuanced approach is because they hurt the development of other countries, unless those countries set up remittances or job contract pipelines. But even so, there’s no guarantee that the baseline quality of life will improve even as GDP sky rockets.
If you look at where people work, and how they’re the happiest working, it’s when they can find something modest which affords them a reasonable quality of life in their local environment. Great examples of this include many East Asian and Northern European countries. The key difference here is that these countries prioritize building benefits for their populations via education and workforce training and development. Unlucky people in any country will hope to immigrate to change that aspect of their life, which is a failure on the part of their home nation, not the individual.
Some nations have prioritized infiltration of large cap Western companies primarily for strategic geopolitical reasons, and that’s the third reason why I think immigration visas need a more nuanced approach.
Lastly (because I am secretly an idealist), I’d like large cap companies to be responsible with the great power they wield. Large cap companies have a global reach, and so can upset the local economies of any country by interfering with the work of small to medium sized businesses. Imagine if Google decides that it will set up shop in South Africa because the U.S. curtails all H1B hiring. Some people in South Africa will benefit, but the overall effect will be that the majority of the population will desire to shift its behavior so the individual can work at the best possible economic opportunity. While that sounds like an ideal scenario to a Western-educated liberal, consider that many businesses in local communities will lose out on potential high-skilled workers. The ecosystem of workforce development and employment needs to balanced against community development. Large cap companies subvert the function of local communities by shifting the calculus to economic optimization, whereas healthy and thriving communities have other goals as well.
Populations as a whole have lost sense of purpose because the main reason most people work is so that they can stop working. But globalization perverted that mindset by prioritizing the needs of large corporations over the needs of local communities. People still want to stop working, but they don’t know how to reach that goal. This problem exists because more than half the countries in the world have sacrificed their own development in favor of developing workers for large cap companies in Western countries.
Bit of a hastily typed ramble, but I hope the gist of it is clear enough.