When you’re dealing with multiple sessions (meaning a website visitor came to the site more than once before converting) the conversion data can be displayed in multiple ways. This is called “attribution modeling.”
Is there a point where it can run on auto-pilot, or is it dynamic, changing & adjusting forevermore?
DSA Campaigns are used as learning experiments - You may choose to build dynamic search ad campaigns because they help you learn what ad copy & keywords to use in the other campaigns, in case you missed any important and effective words.
Start new campaigns with a manual bidding strategy until the algorithm has enough data to switch to automatic. Then, see how high you can push the algorithm to automatically raise its goal (i.e. target CPC of $X could be the goal). You must have conversion tracking set up correctly before running any campaigns or else you will be feeding the wrong data into the machine learning algorithms, which will obstruct its ability to get results. You can check this by going to the Conversions report and checking the “Include in Conversions?” column and making sure that only the appropriate conversion actions are included.
This process will vary greatly depending on whether it’s a site redesign or a new domain….