Everybody wants to work on the fun stuff. Turns out in software, getting something to actually deliver value (meaning convert it from prototype or proof of concept to something running in production) is 90% not fun stuff. Most people learn that in their first job.
As a software engineer the only way I’d become a “data scientist/trader’s servant” is if I’m getting paid exorbitantly. Otherwise it’s the worst kind of work because someone else is going to get credit for everything that goes right while I take the flak for all the hard stuff.
The converse is that to get a software engineer to be your servant you better also be really good, or else you’re probably going to end up paired with someone who doesn’t have the luxury of taking other jobs and maybe won’t be particularly good at getting your stuff to actually run.