As someone who’s done UX for 20 years, I agree with you entirely. Some of the value of a UX process is that decisions are reversible. When you user test it can be difficult to integrate the results, especially if many things are wrong. With a thought-out design and a good paper trail of decisions, design decisions can be evaluated atomically and the team can react faster to user feedback.

Sadly, some of the value of a UX process is that many teams will not test with users at all. A process can give people a better shot at building something useful to begin with.

But your point stands well for most software: sketch something Good Enough, build it quickly, and get feedback.