I just finished a 6 months no-caffeine trial, and there was literally not a single thing that changed in my life for those 6 months, except for the lack of tea/

I just finished a 6 months no-caffeine trial, and there was literally not a single thing that changed in my life for those 6 months, except for the lack of tea/coffee (I replaced coffee with roasted grain drink for the 6 months). No withdrawal syndrome. Nothing has improved nor worsened. I started drinking coffee again 3 days ago. Can't feel any change, either.