Evidence doesn't point in that direction though, even if we establish correlations.

Like the education effect is pretty obvious: most people will use it to cheat on their homework and avoid learning. Some people will use it to learn new topics or with more depth, and give them additional targeted probing questions to answer (basically, give them more homework). Average achievement will probably drop. The high achievers will probably do even better.

Boiling it down to "it harms your brain" when people are already telling you how to use it to learn more effectively is just silly. Most people are happy to rot their brains. They'll take any opportunity to do it. If you're an outlier, you're probably aware of that fact on some level, and it doesn't make sense for you to make decisions looking at the median who behave completely differently. You have to look at the mechanisms behind the data and interpret under what situations they could plausibly apply to you.

Like I said, the parallels to the 1950s tobacco usage is glaring. People used to say the exact same about cigarettes, that the way they specifically use cigarettes, the way their body is build, the way they control the habit, etc. etc. all leads to them being unique in some way or another making the habit healthy actually.

The evidence were all pointing towards tobacco being both addictive and unhealthy, but it still took two decades for the evidence to become clear and public health experts to be proven right. Maybe in two decades I will be proven wrong and you will be proven right, but I doubt it. When the evidence are all pointing in one direction, it is usually because they are right.