Show percentage for all columns in a table?

I can only see percentages for some columns in a dashboard table, e.g.:

Why aren’t the percentages shown for all columns (only Visits in this case)?

In my matomo installation, those mouse-over percentages are shown wherever it makes sense, at least as far as a quick test shows. Metrics like “avg. time spent” oder “actions per visit” or “bounce rate” don’t make sense as a “percentage of all” value.
Where/what do you think it is missing?

Maybe it makes more sense with the totals row showing:

So I’d like to see the percentage of Total Visit Duration per row compared to the total amount of all rows.