Are you high or trolling? I responded to "EDIT: You dont know how vassals are counters to the rest of the mechanics? My dear for the last year the game should be named Vassal universalis instead" with my statement "No, sorry, but they have ALWAYS been part of the game." and your response to me is "if you think that vassals have been a core mechanic for only a year and not the entirety of the games life you are sorely mistaken"? Are you kidding me? It's like you read the first few words of a sentence or miss that a quote is someone else and not me or something. Seriously, give me a second look; I DO actually do the same courtesy for you.
I linked a handful of revolts. I linked the one in china as an example of a revolt having the POSSIBILITY of being massive and brutal without foreign support. This revolt was considered the second most devastating event in terms of human life in history, and happened in an insular country that was the most advanced in the world. I stand by it as a clear refutation of the poster I was responding to. I also posted a series of ottoman revolts. These were not meant to demonstrate revolt size, but rather the instability that results from overextension - Suleiman the magnificent was undeniably both legitimate and stable in his rule, yet faced revolt due to the hardships of his constant warfare and expansion, and the burden it placed on society as a result. The final link I posted was the seven years war. In this example, Great Britain carved out a massive swathe of territory and the result of it was hostility and revolt. The resulting tariffs and disputes over integration and conflicts between settlers and natives led directly to the thirteen colonies' rebellion and revolt and the formation of the USA. This was a refutation of the notion that overextension cannot cause revolt. There are plenty of examples, especially in the case of Great Britain, where foreign wars caused tension back home and not just in the conquered land.
For your response to ChildeR, what are you going on about? Is the problem that the backwards territory revolts with the home nation's units? This is just a predictable game limitation - rebels revolt according to type and owner. They don't know what units to use based on some other country. It may be modifiable to use the units of a country that still exists, but gets tricky when you want a revolt of a fully annexed nations to use the units of that nation that no longer has units. If, hypothetically, welsh patriots spawned in England near game start, what are they based on? Wales and Cornwall have never existed; they don't have tech/units. They have to base it off England's units. The same logic gets applied to unrealistic circumstances when England conquers and fully annexes Kongo, and they revolt with artillery. No, it's not logical, no, it's not historical, but yes, given purely the limitations of the game, it does fit. Consider alternatives - what happens if I start as Brandenburg, conquer Mecklenburg within a year, and they nationalist revolt 40 years later? Should they revolt with mil tech 3 units because that's what Mecklenburg had, or with current Brandenburg units? You either get severely crippled uprisings OR overpowered primitive ones. No, it's not historical in this small instance; it's a game limitation. Meanwhile, basically any other kind of revolt (peasants, pretenders, nobles, etc) seem to carry the composition and technology that seems appropriate to their situation. Peasant revolts do NOT bring a lot of artillery, while nobles and pretenders certainly should and do; they'd have military backing.