Is building in public effective for B2B products or only creator tools?

Transparent updates work really well if your target customer is another founder or creator who hangs out on tech social networks all day. But if you're building software for traditional industries public updates rarely reach the actual decision makers.

At a certain point manual outreach and targeted marketing seem to produce far better results than posting general product updates.

Where do you draw the line between useful public marketing and wasted founder effort?