You can judge shop if you have the right venue. Some districts only have a single judge, you just have to make sure you file suit in their district. Of course that isn't the case in MD, so you can't really judge shop here.The plaintiff has no control over the choice of judge at District or the three judges chosen for the panel at the Appellate level. If we put all our eggs in one basket and pull the short straw, we're screwed on everything until and unless the case makes it to SCOTUS in a half decade or so.
Also, IIRC, attorneys are often limited by courts in the size of their briefs. The broader the claims, the harder it is to include all the arguments and cites needed in a document limited to X number of pages. Better to take on the worst first, and use the space given to make really solid arguments on a subset of issues than generalize and lose on everything.