You have to concede though that once someone sets up the call order, it's really unlikely to change unless there are bugs or someone's coming to do some yak-sha

You have to concede though that once someone sets up the call order, it's really unlikely to change unless there are bugs or someone's coming to do some yak-shaving. People just don't write productive programs where the instruction sequencing at the function level is non-deterministic or chaotic. The UI is already insane enough with CSS and browser differences fighting you every step of the way to make it worse with clever preambles.