I had some exposure to Epic at my previous job. Any software or technical challenges in this space (and there are real ones) - pale in comparison to getting the tech to work within healthcare processes.
Hats of to Judy for cracking that alchemy.
Healthcare tech is an absolutely terrifying space full of process complexity and technical debt.
I've seen systems where part of the process is using an automated letter opener and automated scanner then optical character recognition to get patient bills into a system - because there was no hope of switching some paper aspects of the process to digital.