I think the biggest problem with templating/reusing instead of boilerplate is just how hard it is for a dev to answer the question(s): has somebody already done

I think the biggest problem with templating/reusing instead of boilerplate is just how hard it is for a dev to answer the question(s): has somebody already done this, is their solution flexible enough to fit mine, etc. Hell, just helpers/utilities functions within an organisation aren't always used, devs end up reimplementing stuff all the time simply because there's no easy way to know about it (documentation is only one part of this).