SS, though very corrosion
resistant and pretty has some serious drawbacks that don't get nearly as much attention as they should...
First of all it's not fully rust-proof unlike popular belief; it suffers from crevice corrosion
. Invisible to the naked eye, but potentially devestating nonetheless. There are types of SS wire that are extremely polished to further reduce this type of corrosion, but they are expensive. Any oxygen deprevation makes this process worse.
Second, SS has very poor metal fatigue capabilities. It becomes brittle after so many load cycles. Every time you tack, the lee shrouds get slack and when you tack again get put under tension again. Do this so many thousand times and they can snap. Again, invisible to the naked eye, but a potential problem for sure.
Lastly the swageless fittings can start to form tiny cracks. They can generally be spotted during proper routine maintenance
though. As can improperly swaged terminals if you know what you're looking at.
Norseman/stalock terminals are amazing, and if you have money
to spend or plan on keeping the boat for another few decades (insurance companies usually stop covering standing rigging related claims when the shrouds are 10-15 years old). The wire itself is generally only half of the cost of re-rigging, so do the math. Another option is rope
standing rigging, or galvanized (that's what I just got, full set all in for 400€). But that's a whole other story...