Batch editing

I have a series of activities that I'd like to do a batch edit on.  I have no idea how to use scripts, why can't this just be an easy tickbox feature implemented by Garmin and part of the user interface?

Seems it once upon a time, it existed and it's been removed, now all I can find are scripts from users but I have no idea how to use them nor should I.  Batch editing is a pretty basic feature - why doesn't Garmin have it anymore?