Sorry, that was indeed badly phrased, and your point is very well taken; I apologize for giving the wrong impression. What I meant -- and it's hard to phrase -- is that it's often stuff where if they miss it, there will be something similar along later.
I was really thinking of the way I work. If I'm not shooting for a specific purpose -- money, to help a cause, to illustrate a book -- I find it much easier to shrug and not worry about missed pictures; I can shoot my local village any time, for example. But I'm shooting seriously, not just for amusement, I'm not going to waste time faffing about with anything that slows me down unnecessarily. 'Shooting seriously' would, I think, include shooting my children (if I had any).
In other words, I pretty much said it backwards. If I'm shooting anything of consequence (regardless of how you define 'of consequence'), I'll shoot it one way; if I'm shooting 'nothing of consequence' I'll shoot another way. Thus if I walk to the next village -- a couple of miles -- for the sake of the walk, I'll cheerfully take my Retina IIa in an ERC, even slower than a half-case. After all, I may take no pictures at all. But if I have several pictures in mind, and they are the reason for the walk, I want something I can use faster.
Cheers,
Roger