Agreed there is a lack of keyboard tutorials in this genre. I made a thread a few weeks ago about a few short YT tutorials by Matt Johnson of Jamiroquai, and people expressed appreciation for something as short and limited as that. There seems to be an increase in web-based tutorials lately -- there has been a decent amount of discussion here on courses by Herbie Hancock, Tony Monaco, Lachy Doley, and I think Joey D -- but still far from the volume of materials for other instruments.
I'm sure others will offer more thoughtful explanations but I'll throw out two factors. First, I'm pretty sure the demand is lower. Millions of guitar players out there, and pretty much anybody who buys an electric guitar is interested in playing popular music of the last 70 years (Rock, R&B, Blues, Funk, Jazz, etc.). Fewer keyboard players by comparison, and their interests may not be on contemporary music -- some just want to play classical.
Second, building on your (positive) stereotype, the keyboard players I know are the most resourceful people amongst the gigging musicians I know. In other words, perhaps the publishers don't handfeed material to keyboard players because they (we?) are the type of people who know how to (and prefer to?) figure it out on our own.