> It might be worthwhile to ensure that a web app you're developing will work on a less powerful machine

If that’s your goal this machine is still too powerful. Web apps generally care about single thread performance. The machine has a single thread performance that exceeds any and all Intel/AMD processors, according to Geekbench (A18 Pro: 3445; Ryzen 9 9950X: 3385). My own test for ensuring my web app performs well involves a machine less than half as fast, and my web app runs with all assertions turned on.