I have had the threads on my regulator and cylinder replaced last week for the reasons you mention above. Mine had been usncrewed a lot of times and the threads on both the cylinder and regulator were knackered. I think the quick fill is a good way of stopping this happening. The only thing with them I think is to fill the gun up very slowly, if you do it quick I think it can damage the internals of the regulator. You probably already know this tbh.
You can never shoot enough pellets