If we assume that old jobs lost to automation and efficiency are simply replaced with new jobs, then how can we measure we are actually producing something of r

If we assume that old jobs lost to automation and efficiency are simply replaced with new jobs, then how can we measure we are actually producing something of relevance and actual utility with the new jobs? For example, farming is pretty vital as work per se and it used to cover the majority of people. But these days, if a percentage of people can do the farming for everyone then what would constitute equally meaningful jobs for the rest of the 99%? We basically need food, clothes, housing, and heating. Then there are things that we "need" (but can do without) such as electricity, plumbing, running water, etc. Some people would become artisans to produce specialized goods or merchants to trade those goods. These are pretty quickly and efficiently implemented with the current efficiency and if that was all, we'd probably have employed few percent of the work force. What's there left to do that would genuinely cover the rest 90% of the work force?