You really don't get it, do you? It is up to the people taking industrial action to decide what their action will comprise of, and how much it inconveniences other people is not remotely a factor - it is about winning.
Teachers don't call all out strikes because their unions know that they would lose the ballots - there are very few groups that would support all out strike because it means that their own members will lose all their pay too. It takes desperation to call an all out strike - you are so concerned about the loss of all their pay for others, but the actors (and the writers) are also losing all their pay. Nobody makes that choice lightly.
Strikes are about winning, and you go for winning or you don't go out at all. Half-hearted measures don't work - in fact you could argue that the "occasional strike days" strategy is why the government find it so easy to ignore them - they are only mildly inconvenienced, and a bunch of occasionally pissed off parents are easy to manage.
You also haven't factored in that this action is taking place in the USA, where labour laws and attitudes are very different, employment rights are poor and working conditions far, far worse than people in other developed nations expect to see. Comparing people taking indistrial action in the USA - where such measures are actually quite uncommon - to industrial action in the UK is like comparing apples and oranges.
Personally, I think that conflating pay and AI is actually a tactical error, because I suspect that the latter is unwinnable and so requires a more nuanced approach. Technology has never been stopped by industrial action - the Luddites proved that. And I also think that an all out indefinite strike could push employers in the opposite direction, and into looking at ways to reduce reliance on actors. I would have gone after pay and conditions, which are more winnable, and look at other strategies to manage AI. Any undertakings the employers might give on AI probably won't be worth the paper they are written on. But it isn't up to me.