If people want to play on Vitals, Admin, Cams, and Door Logs that is their playstyle forcing them to do task to will change their playstyle making the game more bland like if you want to do cams you have to have finished all of your task. This will also change how imposters play if someone can't use Admin they are free to vent and kill in any room without having to call coms so admin is disabled. Most of the crew will want to finish task first which will make crew more predictable and most games will be the same.
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It wouldn't be obligatory, the idea is that you can customize it, like you can customize the task bar show, anonimate votes, visual tasks, confirm ejects (that modifies the way you play). It wouldn't make it predictable, and it would give some incentive to people to spread at the start, instead of grouping.