No safety issue , at all , they needed a little Re tightening when new , just bedding in really . I check them every month or so as I would any other bike . But never found one getting loose enough to be anything like a safety issue , you would notice play and noise long before anything fell off .
I had a creak related to a suspension joint and slightly overtorquing the bolt has cured it , the linkages are quite hefty and I think benefit from tightened a little more than they say , but as said above all bikes should have components checked regular for tightnes, things coming loose is a normal bike problem .