actually, Taiwan is only secondary in an actual Taiwan scenario. Bomb their air defense, ports, fuel storage and electricity, which is much easier than attacking mobile ground forces, and they starve. Taiwan is 70% food import dependent and 97% energy import dependent.Technology has indeed changed, and it is not POSSIBLE for PLA to win in a Taiwan contingency, but I think it is a matter timing, overwhelming firepower within an extremely short span of time (hours, not even days), COMPLETE incapacitation of blue forces (especially air defences) within hours before reinforcements (from US and Japan) could mobilize, and capture of key landing spots (especially ports for unloading armour) BEFORE the arrival of reinforcements. If the PLA cannot achieve all of these objectives within hours after the first barrage, China could risk losing the war before it even starts. In other words, the PLA would need to completely establish new status quos in Taiwan within a few hours completely to its favour. Or the situation would just turn into a war of attrition (with full US, Australian, Japanese, and Indian involvement, so two front war for China) lasting months before returning to status quo ante bellum. The current ROCA strategy is for Taiwan to last for at least a week, and the PLA's job is to stop that within a matter of hours. Otherwise as soon as the QUAD gets its forces in order and start flying to toward Taiwan (in Jai Hind's case, open up a new front in the Himalayas), it would be game over. . Thus, I believe it is possible to win, but the first wave of attack better punch above its weight, or else...
As with amphibious landings, the PLARF and the PLAGF's PCL-161 units (and PLAAF units as well) would need to closely coordinate with the landing force to "clean" the proximities of each landing sites and ports with cluster and thermobaric munitions. The amount of joint force collaboration and firepower needed in this scenario would be unprecedented even for the US military.
Honestly, the speed, firepower, and joint-force collaboration needed in this scenario would be unprecedented in human history. Definitely extremely challenging for the PLA, but it is not impossible.
Now adversaries have a choice: watch Taiwan starve then surrender and suffer a PR blow 100x worse than Suez, or go on the offensive and invade. Invading China is the only way to stop Taiwan from starving. As proven by Ukraine and Iraq, even with air superiority it's almost impossible to stop mobile MLRS and SRBM TELs from shooting stationary targets like port machinery. But if they fail at invading China their expeditionary forces get crippled and they lose the physical basis of imposing hegemony.
it would be very difficult to establish air superiority over not just Fujian but Jiangxi, Zhejiang and Guangdong as well. That's all within the range of SRBMs like DF-15. They'll also have to establish naval supremacy in the Taiwan Strait to sweep mines. So they can't do a 'light' attack. They commit all or nothing if they want Taiwan back.
India can even be ignored at the border. There's no road from the Indian border to anywhere of value in Tibet. Bait them into the Tibetan tundra, bomb the mountainous supply lines behind them, they won't even have anywhere to surrender. They'll just starve.