Always good to re-think the purpose for survival kit contents.

I-have-not-used-it-yet analysis may might propmpt a re-think on the more likely survival scenarios, but the scenarios and not the non-use should rule. Still want to cover the bases whether or not life has been kind to you and yours for a while.

Some gear also has a useful life and should be replaced periodically, but that is a different aspect of keeping your survival kits ready to serve their intended purposes.