No. 3 is an attempt to provide some directional ideas to consider when deciding whether to opt-out or stay within competence of the UPC for national bundle patents. Of course, this question implies to speculate about a not yet implemented court, but merely declaring it as complicated or unpredictable would be a too simple excuse.
From the promoting side, you can hear stories that the judges will be experienced, originate from all over Europe, and be trained to apply carefully drafted rules in harmonized manner. Sounds quite much to be realistic at the same time. I will try to draw a slightly different scenario (without pretending that it is the only one possible).