Agreed, Laver and Rosewall were equally skilled at baseline and net play, while Federer is not. But I couldn't vote for Laver in this thread, because the OP asked for baseliners. Of course Laver had a great ground game. But he was no baseliner, in the sense of someone who spends most of his time at the baseline, and does not usually attack the net as often as the great serve-and-volleyers did (I have to qualify with "usually" because every once a while a baseliner, like Wilander, will post over 100 approaches in a single match, as in the '88 USO final -- but that is an exception to Wilander's general tendency; he's still accurately called a baseliner).
If the term "baseliner" is conflated with anyone who has a great ground game (like Laver), then what term will we use for a player whose general tendency is to hang back at the baseline?
To me it seems clear that the term "baseliner" has to be reserved for that kind of player. Otherwise it just points to ground strokes, whether the groundstrokes of Harold Solomon or Stefan Edberg -- that is, irrespective of how much the player hangs back and depends on his ground strokes.