Like any company, there is constant search for new blood to rejuvenate our portfolio. As time goes you will realize you get to know more companies and try them out. Some will end badly. A few will flourish. That's part of the game.
...However, even a 1% position we will need to think carefully. Often I make the mistake of dismissing their impact which then adds up. For example my foray into tracking the few minuscule US stocks end up bad in the trade tariff frenzy. It could be a lot worst if is a much larger positions.
Land Mines
Passive investment to me is more on not running the businesses literally and there aren't a need to monitor their price closely. That's doesn't mean we are passive in keeping up on our entire portfolio and not checking how they do in price daily. There is constant look out for ...