I'm a primary teacher - and a parent. I spend hours and hours (days and days) writing reports. Then I listen to parents at my child's school ripping the same kind of reports to shreds because the don't like them. Makes me want to cry.
We are, by law, required to report against the national curriculum. I spend more hours all year logging ticks on an assessment system to record what my children can do. Each statement of attainment has 3 levels - beginning to, developing the ability to, can do...
At the end of the year the assessment system compiles the reports for us. (If you have 2 children in the same year who have achieved the same progress then you will naturally have very similar comments.)
But... first we have to create a template for the statements.
Then we have to add our own personalised comments (I'm at 12k words at present for that bit and I'm only 2/3rds of the way through). That requires me to bring home boxes of books to refresh my memory of what the children have done and can do.
Then we have to proof read the generated comments that have been created as we need to check they actually reflect the child in question. The proof reading and tweaking stage lasts for more hours and hours.
Nearly every school in my county uses the same system so lots of the reports are pretty similar.
I've occasionally used copy and paste, but only if the comment does truly also match the second child, and only then if I change it slightly too.
As a parent, when I receive my own child's report I find those generated comments interesting as I can go to the national curriculum and spot which level she is working at in each subject. But I do find that I am most interested in the main, general comment at the end (last year at the beginning) of my child's report.