I agree with this part, however that doesn't mean that you should plan to NOT be the best buddy you can be for a team mate out even possibly a complete stranger that happens to be at the same site.
Planning to be self reliant and a solo diver is about self rescue, it's about YOU. Carrying a long hose is about being ready to deal with a situation that another diver is in, after all THEY may not have planned the same as you, or be as experienced or may just be in full panic mode and not thinking or acting clearly.
The carriage of a long hose undoubtedly brings advantages in almost all situations, whilst being no disadvantage to you in almost all situations. I therefore see no reason not to carry one in almost all situations. As I see it, the potential advantages far out way the potential disadvantage, as such I believe it's the best choice.
Just my opinion of course, we're all entitled to our own.