Meditech is a DOS-based EMR. That means for many functions, you are restricted to keyboard commands only and mouse is non-functional. This can make routine functions time consuming and unintuitive. Essentially, all the restrictions you would think an early 90s computer program will have, this will have. That means many routine medical tasks may require additional steps or have technological obstacles.
It will take time to get used to. Learning curve may be larger than most given the above.
The issue with HCA is that they are the biggest system, which means interfacing with meditech is inevitable if they continue to grow and purchase systems. They will use no other EMR given that meditech is their own frankestein of late 80s/early 90s technology.