Aye Up,
The whole idea of carrying a tarp is to minimise weight Janne?
And there’s me thinking that the whole idea of carrying it was to provide shelter and at the same time enjoy the open aspect and open fire possibilities of lean-to configurations. (Not forgetting water collection, bundle-carry of materials etc…
Whilst improvisation (with available natural materials and/or those which you already carry) is a key aspect of self-reliance/bush-crafting, so is being appropriately prepared!
Well, before a tent there was a tarp..
A tent can do everything a tarp can do, open it and enjoy the closedness to the fire while watching nature. Use the outside part to create a lean to.
Collect water and carry stuff too.
Plus, one thing only a tent can do. Block flying insects getting a meal.
Of course, reversing the thought, a tarp can do most of the things a tent can do. Except the insect bit. And is lighter.
What is a tent?
A modern tent is a (shaped) waterproof tarp with an inner insect blocking part.
An oldfashioned tent is a tarp with added walls so it resembles a small house or hut.
Had you lived in Scandinavia the insect blocking aspect would be very important.
I use a tarp made from an ultralight material in coastal ( mozzie and gnat free) environment. Have one pole which is my walking support. It weights less than 300 grams and has very generous space for two people if pitched tent like, including cover for both back packs.
Then I have a custom made tarp made from oiled/waxed heavy duty canvas, which I used to use as a long term / basecamp shelter in a wood when I lived in UK and used for a couple of years when I trained my son in the ways of the outdoors. Heavy, about 4-5 kilo.
Yes, for me the main benefit with a tarp is the weight saving.