I hate writing these, so bear with me...
I've been running a lot of Mythic+ lately, and since I like to have some control over the quality of the people I run with I tend to build the groups. I've found WoWProgress to be a very helpful tool to identify people who know how to play well. However, looking people up is a slow process, especially since 50% or more of the people playing this game have an alt code in their name.
So, I threw this tiny little addon together. Whenever someone applies to your group, it puts a link in chat. Simply copy/paste into your browser to be taken right to the player's WoWProgress profile.
NOTE: THIS PROBABLY WON'T WORK WITH THE DEFAULT BLIZZARD CHAT UI!!!
I use ElvUI, so I know it works with that. I think Prat probably has support for URLs in chat as well, and probably other chat enhancement addons do it. This also assumes you're on a US server - unfortunately blizzard doesn't have a way in the API to tell what region you're in as far as I know.
I welcome feedback and suggestions!