[throwawayoldie]

> A horse and carriage is very useful for lots of things. A horse is more specialised.

You have that backwards. A horse and carriage is good for traveling on a road. If you have just the horse, however, you can travel on a road, travel offroad, pull a plow, ride into battle and trample evildoers, etc.

[Frummy]

No it's only half backwards because of the infrastructure there is scalability in amount of work you're right in the phrasing however but the intention/idea matters more. So the horse and carriage is a generalization of the core value of the horse and increases the core value and generalization -> general, horse more specialised or at least reduced to niches today like competitions and hobbies