On the bold, you're absolutely right, and I'm not sure that most people understand that. There is nothing stopping anyone from naming a potential target defendant in a SOC - and then, as you pointed out, resources are required to defend against it. Money well spent - but spent!
I have seen few defendants released from actions until after the Examination for Discovery process has been undertaken, which takes quite a bit of work, time and expense even to get up to and through that point. You can always try, but threatening costs if not does not usually scare too many Plaintiff firms.
As I mentioned, with 1% liability on the books - they're going to look anywhere and everywhere for potential defendants.
On costs, my experience differs a little - most times if we are successful and seeking, they are awarded - sometimes in full - sometimes partial - sometimes up to the max ( small claims ). Collecting on them is another story