I don’t know if it’s just me, but when something goes wrong in a mission (yes, that really does happen) and I crash or have to abort the mission due to a simulator bug, that mission can no longer be found in my career mode world map. If I hit ESCAPE before the crash then I have option to restart the mission but that will only let me repeat it immediately. If I quit the mission entirely using abort, then I can’t find it again.
If I fail a mission then I should be able to try it again later. Yes, I’ll take the reputation hit and loss of time in not earning any points, that is reasonable. But all I want to do is actually learn something after investing my time. In earlier version of FS we could repeat missions as many times as we wanted and I usually did so.