I am not sure if I am going to like this feature. I miss the simplicity. Guess those times re over.
We've been using GH Projects at my current org and program for two years. The one feature I wish it had was nested issues.
In Jira, you had Epic > Task > Sub-task and that's it. With GH, you can just have issue > issue > issue (insert "it's turtles/issues all the day down meme"). So it's more powerful, but can be ignored by folks who don't want to do this.