I've been on SE for a while now, and it's always irritated me that I couldn't include (bracketed text) within "link text" in comments.
I've quite often found myself posting a comment where the entirety of the text I want to be visible to other users is simply one or more sentences lifted straight from a web page, so I just enclose the required text in [square brackets], followed by the web address in (round brackets).
But if the text includes round brackets itself (not at all uncommon), this used to mess up the display, so I got into the habit of changing them to {curly brackets}. I've been slavishly doing this for years, so I don't actually know exactly when the HTML implementation for SE comments got "smarter". But I just forgot to apply my "fix" in this comment here, and was most gratified to see that it worked anyway.
I'm not sure "patting the development team on the back" is a proper use of SE Meta, but I'm chuffed. And if anyone else longed for this nifty little tweak, they might be glad to know it's been implemented.