The Enem score is essential for pretty much all Brazilian public universities, but how they use it varies a lot. Most use Sisu, which is that selection system where you list your course options and compete with other people based on your score. But some people mess up thinking they need an absurd minimum score - in reality, it all depends on the course and the competition. A super competitive course at a top university will need a much higher score than a less popular course at a smaller university.
What's important to understand is that there's no fixed national "cutoff." Each university has its own cutoff scores that change with every selection process. If you want Engineering at USP, you need a really high score, but if you want a less competitive course at an interior university, the bar is lower. There's also the case of social quotas and affirmative action that can work differently depending on the institution, so it's worth checking specifically the notices from the universities you're interested in.
About what changed - some places really did start considering school history as a tiebreaker criterion or even as an alternative entry in certain cases, but the Enem score remains the main currency. So yeah, you need to take it and get a good score, but "good" is relative to your goal. Focus on preparation and go all in.