My dad was a one knife man. This is his Richards camp knife given to him by his gran around 1948 when he was 8 or 9 years old.
It was the only knife he carried as a farmer, milkman and haulier for the next 30 years. And it was the knife he carried on two tours through North Africa (where for a time he lived with the Bedouin tribes), Israel and the Lebenon and what was then Abyssinia and Persia and into Afghanistan.
It got relegated to garage duties when he turned white collar in 1980. The handle is more fibreglass filler than anything else and I need a prybar to open the screwdriver.
I could get around with only one knife but I guess it would have to be a camper/scout pattern as there just more useful, but it would be interesting to get by with a just a single-bladed pocket knife. I guess I'd have to use my nous more to make it work.