Morgana's kit being hardly touched during her VGU is NOT okay.
Why do I say this? Put simply, it's because Morg's current kit is outated & does not live up to who she is.
In terms of her kit being outdated - Her W is a puddle, her passive is spellvamp, her E is a point-click CC cockblock (because that's definitely both a fun spell to use or play against, definitely...) & her R is almost never used to its full potential - Why? Because even if Morg manages to land a four, five man initial cast on her R she's both not tanky enough to maintain the chains (hence why she needs Zhonya) & she has nothing in her kit that can stop multiple people (not just one with her Q) from utilizing mobility creep to get out of tether range.
In other words - Morg's kit is bland as can be in almost every aspect. That's not to say her R lacks potential - it would probably be awesome if it had a better kit built around it. It's just that...it doesn't.
**In terms of her kit not living up to her potential **- This one is pretty easy to explain. Morgana is a FALLEN ANGEL. She is supposed to be a being of IMMENSE CAPABILITY who held, challenged and corrupted DIVINE POWER only to fall and to become something even more powerful. That is what a FALLEN ANGEL is - An evil, extraordinarily strong being of great malevolence & magical capability.
And you know what Morg does to show that? SHE MAKES A PUDDLE. SHE HELPS HER TEAM. A BEING OF EVIL, HELPING HER TEAM INSTEAD OF PRIORITIZING HERSELF. She heals slightly from ability usage. I can't even stress how stupid this is, she's supposed to be the demonic equivalent to an angel's power & most of what she does is build support & completely rely on her E. I hate it and I'm not afraid to say it - Morg is a thematic letdown.
Now, I understand that RiotAugust (since he's the one doing the Kayle/Morg VGUs, bless his soul) understands well that Morg's passive & W are outdated and need work. But it's not just them - her E does not fit her character at all, her Q could probably be more interesting & her R never gets to see the spotlight because of the rest of her kit's lack of cohesiveness. So please, don't just look at her W/Passive - Look at the rest of her kit too because honestly, Morg needs serious work.