> They should be brought into the daily standups as 6 months to wait for some delivery seems a bit waterfally (apologies if this is a mischaracterisation).

At least it it a clear mischaracterisation of waterfall:

* https://changelog.com/posts/waterfall-doesnt-mean-what-you-t...

* HN discussion: https://news.ycombinator.com/item?id=37405049

* http://bawiki.com/wiki/Waterfall.html

* HN discussion: https://news.ycombinator.com/item?id=26760606