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I think the different cones are updates, one I bought a few years ago had a manual switch on the outlet so you could bloom it for a bit, the problem was if you’d forgotten about it the brew would overflow a litre of coffee full of grounds over your kitchen.
All the recent ones I’ve seen have an automatic stopper which allows you to pull the jug and not have it continue dripping. It also stops the brewing as there’s a switch that disengages the element when the jug is removed. The coffee tastes great without any meddling I find.
My understanding with the moccamaster is that there are versions with different filters - so there's one that is better suited to brewing a full 1.2l and one that has some kind of function that keeps the water in the filter chamber before letting it drip through - better for smaller brews. May want to check.
We have the standard thermos one at home which doesn't have any quantity regulation on it and just do a litre in the morning between two of us (work from home). Usually finished by midday.
Give it a clean every few months and edscobles your uncle.