The Affordable Care Act mandated use of EMR and heavily funded its adoption. Is there really not one fully implemented open source solution after all that money was spent? Why does this project exist?
EMRs are massive cash cows for the big players (who are now largely just 2, epic and cerner). these products are largely built to comply with regulations and make billing easier. they are build for hospital admins. physicians hate them, and many blame them for the massive increase in physician burnout over the last few years
building one of these would be a pain in the ass as you need to digitize hundreds of clinical forms and comply with a dizzying set of regulations. the architecture for a lot of these things is from the 1970s, but the sheer amount of features needed makes building one from scratch painful. and the market power of the incumbents makes it really tough to even carve out niche features
if there is any group in healthcare that should be disrupted, its the EMR companies