Now it's just butchery on an industrial scale. How nice.
Claiming the opposite is just muddying the waters. Up is down in wartime, I suppose.
Taiwan is very different. Xi also knows it is of far created economic importance to the west (and the US in particular) than Ukraine is.
The miscalculation was primarilly political rather than military. They expected the Ukrainians to roll over rather than fight. Possibly they believed their own propaganda (and their experience from the 2014 invasion) and expected a lot of Ukrainian support. The invaders were not even prepared to fight and the planning was lead by the FSB, not the military. https://www.youtube.com/watch?v=o9ym9TDs6Dg
This still sounds like a huge gamble with very high stakes. Ukraine received a lot of Western weapons between 2014-2022, and it was those weapons like Javelin that helped stop the original Russian armored onslaught.
International politics does not reliably work on the principle "actor X hasn't done Y before, so actor X won't do Y now". There may be thresholds that, once reached, change the entire situation.
To look at a historical example, the Allies did nothing when Hitler re-occupied the Ruhr, they did nothing when he annexed Austria, they allowed him to take Sudetenland and later they did nothing when he annexed the rest of Bohemia and Moravia. But with Poland, the threshold was crossed once and for all.
I am not that sure anymore. The Russo-Ukrainian war shattered a lot of my illusions with regard to rationality of leaders. A country with a very bad demographics started a war by deploying clearly insufficient forces (200 000 soldiers are nothing when compared to the size of Ukraine; Germans deployed 12x as more soldiers in 1941 to conquer Ukrainian SSR) and the result is an enormous fuck-up and unendong slaughter of young population which, with current TFRs, will never be replaced.
If Putin can make such a bad judgment, Xi can as well. It is not as if Xi tolerates more dissent/negative feedback to his rule than his Russian counterpart.