Interesting, Colin (and Dave). Your post and how you created a link to "Top Tech Tools" demonstrates "linking to other posts." Might this be yet another feature of Moodle's discussions -- the ability to link to a very specific post by using a Permalink? I just check my Canvas, and I cannot detect any similar feature (but maybe because Canvas is so simple, this feature is hidden. Someone else will have to verify this for me. )
I use this Permalink feature in Moodle all the time, a feature that is often missed by those not watching or learning moodle. In fact, sometimes students will email me a question (yes, via a normal email) and I will point the student right to a very specific discussion post. From the student's side, they click on my link in the email, if not logged into moodle they log in, then they are taken right to my post.