I suppose I understand your (and others', here) point of view. It's a different experience for me, grading-wise, not because receiving my grades is stress-free, but more because I'm never expecting it - so I don't think about it too much, just live my life, and when that e-mail comes, I check things, and it's done with. It's a superior experience than waiting for a specific day, or time of day. But, of course, that's my experience.
Perhaps a solution would be for these school portal systems to take this into consideration, allowing students to pick how they prefer their grades to be 'released'/delivered - 'unexpectedly', or on a timed schedule.
Quick question... how old are you (college or HS)? And did you grow up in a super-competitive school district?
Watching my son and his peers go through high school (he finished about 5 years ago) in the DC suburbs and the stress level is insane. The good state schools have become increasingly selective since the 90s (when I attended UVA). And it shows in the kids mental health.
Perhaps a solution would be for these school portal systems to take this into consideration, allowing students to pick how they prefer their grades to be 'released'/delivered - 'unexpectedly', or on a timed schedule.