No mode of transport offers entirely hassle free journeys.
If you walk, you might get a bad shoe rub, blister, be hit by a car, fall over.
If you ride a bike, you might get a puncture, fall off, be hit by a car, get shouted at by arses in their cars.
If you use the bus, it might be late, be cancelled, have nutters on it, get a puncture, to the wrong way.
If you go by car, it might not start, it might get a flat, it might be involved in a RTA minor or major, you might get stuck in horrendous traffic.
If you go by train, it might be delayed, diverted, have nutters on it, be in some way impacted by a suicide.
If you go by plane, it might be delayed, diverted, have drunk people on it, get cancelled, be horribly turbulent, your luggage might get lost.
I'm sure that I've missed out a million scenarios for all the things that could go wrong with any form of transport. HOWEVER, in the main things don't go wrong, they go right and everyone arrives where they should do at roughly the right time. If things go wrong nowadays, you can keep in touch with people through the wonder of mobile phone technology and sensible advice can be given or alternative arrangements made.