I look at the change log like a filing cabinet of file folders with tabs. If I don't write on the tab what is in the file folder, then I have to look in each file folder to see what is in it.
or
I might look at the change log like an email list. If I don't display the subject line, then I have to open each e-mail to see what the e-mail is about.
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The biggest problem I have with Find a Grave when I submit edits is that Find a Grave refuses to tell me what the edit was when they send me an e-mail notification about a processed edit. All I know is that an update or refusal was done on some person that I submitted an edit on some time ago. For me to know what piece of information was processed, I have to click on view memorial, then click on the contribute tab, then the suggested edits icon, then the suggestions I've sent tab, then the item accepted or declined, and finally the "sort by processed" menu item and then scroll down to look for the person that the email was about. Now, how much easier would it have been if Find a Grave would just put that information in the e-mail that they sent me in the first place. I consider this to be very lazy on Find a Grave's part.
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Now, getting back to WikiTree. Each day WikiTree sends me an e-mail of the WikiTree Activity for the Tags (i.e., surnames that I follow). Listed is the name of the person editing the profile, the activity that they did, the profile they did the activity to and then NOTHING (up until September 13th) ... because the person editing the profile didn't feel it was important enough to fill in a change explanation. So, now, if I want to know what was done to that profile (and all the other profiles that are listed in the e-mail without an explanation) that some person edited, I have to click on the person's name, click on the Changes tab, then click on the edited the Biography link and then start clicking on one or more entries to see what was done. Now, imagine how much more informative the WikiTree e-mail would have been if the person who edited the profile had simply added an appropriate change explanation. For example, "added a hyperlink to a daughter's name listed in a source" or "corrected a misspelled word" or "corrected a parameter in the 1776 Sticker", etc.
Now, let's suppose that the profile that was edited was a SMITH (currently, 2,511 members follow the SMITH tag). With no change explanation listed, that means that 2,511 Smith tag followers of an edited Smith profile would have to follow the process I listed above to see what the change was, when all that would have had to been done is the person editing the profile to have entered an appropriate change explanation.
The thing to remember is that this is a collaborative website with many moving parts. There are programs that read the activity logs that can provide valuable information to others, but only if the information is informative and present.