Having worked on one of the components of this spacecraft, including design and testing, I've been loosely following this program. By the time it reaches Europa, it will be about 10 years since my contribution.
My understanding of the situation was that they had to design for 2 very different mission profiles depending on the launch vehicle, which was very burdensome to the engineers. The implied politics as I could infer, was the requirement to design for use of SLS as a launch vehicle (naturally, for a NASA mission), which some engineers had low expectations of being operational in time.
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