Love the connection to Zen (I myself have gotten into Buddhism and Daoism over the last few years), and I agree with all the principles…but there does need to be a “north star” if you will. I don’t attach myself to results, because we do not control results, we only control the inputs (i.e. the process), as you have mentioned.
However, for this to apply to our world today, there does need to be a desired outcome (though I would ultimately argue there doesn’t actually need to be, but just to make it fit to modern day business or production). This outcome guides all of your inputs, otherwise you’ll just be doing things that don’t add up to anything more. The process would cease to exist, it would just be a bunch of stuff.
But yes, I would say that any desire for results will ultimately bring about frustration.