"For example, the chances of obtaining a four-star tier character like Thoma, who became available in the Moment of Bloom 2 banner, was 13.04 percent. The downside is that these characters are usually less strong in gameplay. As a result, players of gacha games are constantly faced with a trade-off between either spending their time or their money, and, according to Woods, become strategically calculative to avoid monetary investments in favour of temporal investments." - The turmoil of dating (114)
This is exactly what I was saying with the character systems. If you dont have the character that you need for a certain mssion it would be a lot harder to progress in the game because now you would need to take your mind off the main quests and do side quests to get the resources you need. And once you have the resources you need you dont even have a guaranteed chance to get the character you onlu have a 1 percent chance so if you dont get the character you just wasted all that time gtting the rsources you need for the charcter you didint even get.