I always work on the basis that recovery can get the car home and I can then fix/torch it as appropriate. Hasn't failed yet
That's always been my approach; even when running 20 year-old £25 cars as daily drivers(600 miles a week) for several years, I've never found any need to carry tools or spares beyond new points and condenser - and only from the early '90s when the quality dropped through the floor and failure rates rocketed. I did once use the AA patrol's tools to refit a Pinto cambelt, rather than have it towed home, but I was on my way to a party. The only reason my large socket set is now in the car is that I no longer need it for work and have nowhere else to keep it. I have always fixed stuff as soon as it presents a problem, whether it was a funny noise due to a failing drive belt or buying some new bellhousing bolts when changing gear on roundabouts became impossible.
13 years driving a recovery truck actually reinforced this opinion. I'm not buggering about with my car at the side of the road. I can just about accept keeping a
working when it was removed(the real definition of known good) crank sensor, but a HBV/alternator belt/tensioner pulley? Those fall into the same category as holed sumps or suddenly leaky radiators - possible, but not common enough to worry about.