Second here's what you actually said: "The only real military examples where non-European people actually drove the colonizers out were in Taiwan and along the Amur." Yes, you are most definitely being Eurocentric here, even if I assume that you believe that Morocco and Oman are European for some bizarre reason. I don't know how you can make a statement equivalent to saying that Europe never really lost except to the Chinese and somehow expect people not to accuse you of Eurocentrism.
I should definitely have phrased it better. I really don't make a major distinction between any of the Western Eurasian civilisations - they're all roughly in the same basket in terms of capabilities. You make an excellent point that Eastern Eurasians should generally fit within the same basket. From now on I shall do so and just call everyone "Eurasian".
The primary focus of highlighting Africa and Siberia and the Indian Ocean is that the expansionist powers of the 16th c. were fighting people who were more numerous than the Americans, objectively tougher targets militarily than the Americans, did not experience much of a technology gap, and did not have the disease disadvantage.
Despite all that, the expansionist powers of the period did just fine against these much tougher opponents. It's not that they never lost - they lost plenty, if they don't lose how do they learn? - but that
they couldn't generally be kept out by military means.
There by contrast are plenty of places that were colonised only very very late. They are usually very remote, unsuitable for Mediterranean crops, and don't have enough density to sustain occupation through extracting food locally. Local resistance usually helps in making the cost somewhat higher, but if the incentive is high enough this resistance will be overcome.
I think the higher cost in a powder-less world (mostly political, internal to the colonizing states) might discourage serious attempts for much longer, since even OTL all of the overseas conquests were done on a comparative shoestring when measured against wars and state projects closer to home. If the costs of colonization are not marginal, there may be no attempts at all. However if there are attempts and the goal is seen as worth the cost (central Mexico, for example, totally worth the cost), then attempts will proceed until victory.
Is this a joke/sarcastic remark, or do you really think the Bijagos are the only examples of Europeans losing terribly? In Africa alone the Portuguese were forced to pay tribute to "Monomotapa" after several military defeats.
...for one generation, against an enemy whose core territories lay so far that they couldn't sustain anything sizable there until the 19th c. anyway, and against which they exploited an opportunity when it arose to turn the tables around.
Good on the Mutapans but it's far from the "disaster" you seem to think it was, and they weren't
kept out, which was pretty central to my original claim.
I do appreciate some additional perspective on how much more difficult the Portuguese Empire was to achieve than the Spanish equivalent, however. It's useful to get a new look at things, and this forum is good for that.
I believe it is fairly clear from contact that what was meant is the mobility of horses during the principal conquests of the Americas is overrated, since the main conquistador teams rarely actually had horses in numbers.
Then we don't really disagree? Yes, horses were a minor though not insignificant factor in terms of military impact on the original conquest, but they were integral to
producing a civilization that could launch such a conquest and
once they arrived in numbers they changed everyone, Spanish and American alike.
Since this is a hypothetical about a pre-gunpowder invasion of America rather than a detailed case study of Cortez' campaigns (which I think is overly specific if we're trying to grapple with a question this broad), dismissing horses seems pre-emptive. A powder-less invasion may have more emphasis on cavalry, for example, or take longer. The longer it takes, the more time for horses to make an impact.
All of these things would need to be considered over a much longer timeframe than if we were solely focusing on one single event.