Theres no point in going to Colonia if you arent exploring. Why waste developers time on making a ferry service just cause a few people are too lazy to travel there themselves.
Travelling and exploring are two very different things and both are very much part of the game. You don't really know what i would do once i reach Colonia but going there from the bubble is simply going to point a to b with a few stops and that's not really exploring. And its not "hard mode" or any other "mode" for that matter.