> My developers should not have to put up with customer success, or business requirements, or budget constraints.

Au contraire. You are right that there is only so much time in the day and that not every IC can be deeply engrossed in this, but all should be involved in at least some surface capacity. This is the most important part of the software development process! To remove your software people from it is complete insanity. It being treated as something different under a "leadership" umbrella is the most horrid thing ever seen in the software industry. This is echoed in the Agile Manifest (Twelve Principles), as you know.

And maybe that's what you really mean — that you're an IC who spends less time on code and more time on business problems? That's not what is usually implied by "leadership", but it is understood that anyone can make up random definitions on the spot.