The leak path is very real. Due to the quite bulbous section on the inside diameter. There is no issue with that on the spring clips. Jubilees slip the thread, rust, seize and break. Plus they flat blade screw driver slot should be illegal on jubilees.
Almost all of the jubilees on my lpg kit have either leaked at some point, slipped or broke during installation. Poxy things, utter rubbish.
Found a clip made by Norma, size specific hence a completely flush inner face around the complete diameter, threaded clamp with the thread in contact around the whole circumference, instead of just down one side of a worm.
But equally awkward to gain access to as a spring clip.
...the Gm jubilees are quite good quality on the omega inlet, yet even they break and seize, going by members cars I see round here with alternatives fitted.