Interesting. My 633 setup, which is the original Slingshot hoverglide alu mast 35.4" + Foilmount adapter + custom "Stringy 743" fuse + 633 FW + 450 stab = 4400g (kitchen scales).
If I had the standard Moses 91cm carbon mast, my 633 setup would weigh about 3200g. Mind you, my Stringy fuse is about 250g lighter than the standard 710 fuse.
Moses front wings are quite light, if not somewhat delicate: my 633 is only 30-40g heavier than my 683S, despite being significantly larger. Not an issue as long as you don't drive it into shells, sand, reefs.
The old hoverglide fuse was ridiculously heavy and added a ton of discomfort at the end of the 35.4" mast (at least, out of the water). It was fine once in the water.
I imagine the new Slingshot system, not dissimilar to the old system, has to cater for several disciplines so it is really built for the tougher applications like windsurf, massive wingding wings... hence the sturdier construction and increased weight.
It's definitely a consideration when buying into a system.