I have to wonder whether we are talking at cross-purposes here.
I am NOT talking about planning to cobble something together to handle several days of glacier crossing. If you KNOW you are going to encounter snow, take the right gear.
But if something really unexpected happens on a trip where it shouldn’t, does it hurt to have some idea in advance of what you can do? Could a little planning help?
For example, one year we were doing the GR11, an 8-week traverse of the Pyrenees on the Spanish side, in late summer and early autumn. Spain is hot, and by this time all the snow should have melted. Indeed it had, except for one short narrow north-facing gully, which had snow up it. The guide book mentioned it as being a scree gully requiring some care, but we often carry 20 m of 4.5 mm Kernmantel rope (212 g). It is useful in many situations. (The Spanish route is less-well developed that the French GR10, and still had a few ‘interesting’ patches.)
So, how to get up here? I had thought about this beforehand, and reckoned on using two things we would be carrying anyhow: waterproof overgloves with liners (you get storms up there), and our Ti potty trowel. I added a stout stick to this for Sue, which we picked up on approach to the gully when we could see the snow. I hacked some rough steps and kicked them too, and formed some handholds, up to the top. The gloves allowed us to ‘dagger’ our hands into the snow. Then I used the rope to bring Sue up. Not a problem.
Were there alternative routes? Not in this country! On the other side of the ridge the side was falling away badly: loose gypsum ‘rock’ I think. We traversed past that on tree roots, literally.
Now, was this sort of planning folly? Should I have carried an ice axe for 8 weeks against the very slight possibility of needing it?
Cheers