In many famus PM coaches talks I keep hearing that product should address users needs while delivering value to the business. Focusing too much on developers may lead to solutions that does not contribute to the business value and let's recall who is the sponsor of the PE and IDP? In my company we do struggle to get appropriate funding for the platform teams because the platform product management is quite new but what is even more important very fragmented across many areas. This leads to fragmented or incomplete vision and without vision there's no strategy so there's no way to proof the value. So Leadership is suprt critical, these are the sponsors, they must be aligned and convinced what's done for developers brings benefits to entire organization.
To expand the picture a little bit, because it's very uncommon, Marty Cagan touch upon Platform Product Management role and mentions about different user types here:
https://www.svpg.com/platform-product-management/
which includes end-user or a customer of the business application, which business application use a IDP.
On the picture above it's not explicit, but I think it's hidden under stratefgy+business needs and it is also important because faster shipped value to the users is also one of the business needs that IDP and PE delivers