Obviously I can't tell what GP means, but I can try to explain my position.
you say: 'will achieve much better results". I don't see that it's clear not at all.'
If you check the policies promoted from the international institutions (and those are, in essence, a product of the USA) they are the opposite of what the developed countries did to be developed. Check Ha-Joon Chang(1) work for a study of this.
Of course, the issue is very complex, but a case could be made, that the small development we see in those countries is despite the American order, instead of because of it.
That's before even talking about all the invasions and coups in countries that didn't follow the interest of USA capital.
A country is not developed by opening its markets, don't protecting its industry and "specializing" in exporting their natural resources, but by stability and investment.
So, from the point of view of small countries, what is the problem with changing masters?
And China is, for now, really investing. For instance, check your example, Niger: https://www.businessinsider.com/niger-oil-and-chinese-invest...
Of course China is just following their interest, but so do the Americans.
(1)-https://en.wikipedia.org/wiki/Ha-Joon_Chang