I agree a source controlled package-lock file for reproducibility would be an improvement. As you alluded to, Open MCT in its current form would likely not be considered or used for mission critical purposes [1] but instead for planning, analysis, and general data visualization, as opposed to something like the AMPCS (AMMOS Mission Data Processing and Control System), which involves command/control and direct communication with a spacecraft.
[1] Mission critical, meaning its operation is required to prevent any possible mission failure. https://nodis3.gsfc.nasa.gov/displayDir.cfm?Internal_ID=N_PR...