Quiz

I assumed you preferred the tag handling in a comparable quiz product. Have you used a quiz product with tagging? Note that for many people the most common reason to update a quiz question is to make a correction. So an update that shows up in other uses of the question would appear to be a feature.

In my view the Moodle quiz engine is the most powerful available anywhere free or paid for with more third party tools than any other product. Having said that as I commented in this thread a year ago,  bulk tag handling would be a nice feature.

The good news is that the upcoming major release (Version 4.0 available around the end of the year) may well make it possible to create new types of quiz plugins which I suspect would include the possibility of bulk tag handling. As a full time Moodle developer  specialising in the quiz, I would like to work on such a thing, but there are so many desirable features and only so much time/money.

You can read about the upcoming new question bank here
https://moodle.org/mod/forum/discuss.php?d=412117

and possibly more here

https://moodle.org/mod/forum/discuss.php?d=417599
And the question versioning feature might address you question about question update/duplication.