I personally do believe that is the case 99.9% of the time. Did you do anything that would have required draining the coolant? A coolant change, water pump, anything in the valley like a regulator or CP3, anything on the driver's side of the engine, pull the turbo, etc. It's not always driving it with a leak to get it that low on coolant, it is often that the system is not bled properly when it goes back together and gets refilled. Not saying that there is absolutely no way to blow a head gasket without air in the system, just saying what we see here on a weekly basis, if not more.
And I agree, take care of your coolant system but "if it ain't broke don't fix it". I think it is a foolish waste of time to install studs without doing new gaskets.