I spent a few hours automating some repetitive tasks in a way that takes almost the entire burden off of my brain. Then I wired it up to a Stream Deck so these things can notify me asynchronously and easily run in parallel.

That was a pretty simple investment, but a total game changer, it saves me gobs of time every month, and was a no-brainer investment.

Granted, not all dev workflows are as annoyingly complex as mine, but nonetheless: you're statement is all-encompassing when in fact it's very context dependent. In my case, your advice was simply not true.