1-3: these points are not really contributing to the issue, as I am sure you will realise when you read it again yourself. except maybe:
it's correct that as of this moment they have 'advantages'
Which the answer is... No. Read the whole thread again, considering every post into your reviewed opinion. There will be differences in buying power, but nothing that concerns you. If you succeed in your country to reach the top division and B3 you have bigger income potential and are actually at an advantage over smaller countries. I understand jealousy against those that get to start in division II-III, but every club in the world have to balance their salary against income*. If your roster salary leads you into negative numbers you are on the wrong path no matter what division you are playing. If this is a problem of a whole country, and the problem every country eventually will end up in, *it is finally the part of realism so many hunger for. Realism is not playing the game at "easy" difficulty. I wish I had a team in a big country, because what I am saying may come of as arrogant, but the point is valid even if we put individual teams out of the equation.
4) as you know, the TL is global, so any one of us is not only competing with other managers in the same country and in the same division, but also with other managers from other countries that maybe have a simpler access to economical resources and that, in this way, have an advantage in the markets and alter the common prices of players, but also trainers.
..if the default is that every team should be entitled to buy whatever player they wanted..? I'm not quite catching on. If a random div III/IV team from a big country get outbid by a random div I-III team from a smaller country you find it disturbing? Will not that player either be overestimated value on, or, cause the buying team to have a higher salary expence? That higher salary expence will lead them to having less buying power next time they are on the market, and so on. It will even out, but not straight away. But no matter what there will always be extremes in every end; the most advanced countries struggle with balancing economy, while the youngest and smallest countries struggle to keep up with the biggest countries. Beeing first in a country have always been an advantage, but after the latest adjustment that adresses league strength it is not so dramatic as before. The biggest difference between an old and a new country is that the newest country has what can be referred to as a gold rush, having the intended effect to draw users from that country to join, while an old country relies on great inventiveness and creativity to succeed. The other thing is that although we compete in the same TL, we do not use the players acquired through it in the same surrounding, so the player not affordable by one division does not compete in the same enviroment, making the level of players available to the division lower, but still relatively equal for those teams it concerns.