I just noticed the statistics tag. If this tag was applied consistently to the site then (almost?) all questions would have this tag. Should it be deleted?
I would suggest removing the tag.
"Statistics" has several senses.
One of them is overly general. It's inappropriate on this site.
Within the field, though, a "statistic" is a summary of data. Some questions have that as their primary focus: what statistic would be appropriate for my situation? What is the sampling distribution of this statistic? What are the pros and cons of using this or that statistic in the analysis of my problem? Etc.
I recently went through and removed many of the unwarranted "statistics" tags. (Due to lack of time I didn't go all the way through the list, though.) Some deserved to remain in the second sense.
Perhaps a good solution is to rename "statistics" to "statistic" and update its wiki appropriately.
When it is about the whole science, as in 2 stats and ml questions it is ok IMO. In the other cases I agree.
The problem with this tag is that when you try to post a question it asks for some tags... and what is your first idea if you don't have any that makes sense? So I think it is something we will be still fighting with.
It similar to
programming tag on SO, it tends to attract meta question about the topic. I think it's fine as long as a question passes usual criteria and is made a CW when appropriate.