The tempo track shares the same envelope editor as the automation lanes.  When using jumps in automation, the dotted lines literally mean no automation at all.  This means if you started a project in the middle of a dotted area, no automation would be sent out until it reached a node. Obviously you can't have an area in the project with no tempo, so for tempos, there's pretty much no difference between a jump and a straight line.  It's really down to how you want to work. Multiple nodes
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