Fade In/Out Lost After Glue Audio Parts

I’m just wondering why you lose the ability to fade in/out audio when you glue two separate events together. Let’s say I have two 4 bar loops that I want to join and fade-in 8 bars, I can automate with volume of course but why would we lose the ability to use the fade function?

Parts can’t be faded, but I think someone posted this as a feature request so maybe search that thread and bump it - presuming, it’s been transferred over to the new forum.