For many, it can take a while to find "the one" that is the art that either is their sole art, or their specialization. Also, if your goal is to learn about combat, IMO it's necessary to at least have had exposure to other systems' practitioners at some level, either through training with them, or getting together and having exchanges. It isn't always that one wants to 'jump ship'.

Some people marry their first high school sweetheart and live happily their whole lives together into old age. Others need to date or marry several people to find the right one. Many simply enjoy the process.

What matters is that you're able to develop properly to achieve your goals.