I don't understand why the pessimists don't see the unlimited amount of work stretching out before us! Why they can't imagine the utopia we could all be working

I don't understand why the pessimists don't see the unlimited amount of work stretching out before us! Why they can't imagine the utopia we could all be working towards. First there is going to be massive amounts of money being splashed around making sure everybody has access to an AI that they control. Both big companies, and on our computers at home. 10-20 years at least. Then we need to actually do the work of automating all the boring stuff like accounting, taxes, insurance etc. (At lets face it, governments are very slow to change and it will be 50 years till we work out the policy let alone the tech implementing the policy) Meanwhile, the tech folks need to turn the attention of the AI to saving our environment. We need massive scale carbon capture of some kind. We need renewable energy sources. AI is not going to just work it out and build it all itself. We need to tell it what we want. We need drones to fly around our forests looking after the bunnies and the squirrels, building a balanced ecosystem. Somebody needs to develop and AI that will monitor our own health, understand more deeply how our bodies work, how to navigate nanobots though our system zapping cancer cells and balancing our gut bacteria. It would be nice if AI could solve aging in the next 20 years. (better to reverse it in my case) Somebody needs to develop and AI and robots that can feed us. Micromanage greenhouses and livestock. Farming has a long way to go before its sustainable and ethical. There is massive amounts of work in just building better infrastructure around our cities. How to clean our water and get people from A to B as comfortably, cleanly, and efficiently as possible. Then once all that is done we can look to the stars, build the arc ships, figure out how much dirt we need to take with us to sustain us. All the while we need to be entertained with stories, games, music and more!