Just posting some of the points that they made:

"I don't even ship this but...

Here’s some Arthur/Gwen scenes that were weirdly absent from the 5th season so far (SPOILERS):

A goodbye between Arthur and Gwen before he leaves in Ep 1.

Gwen’s reaction to Arthur’s disappearance in Ep. 1.

Any sort of insight in how Gwen feels about being queen and Arthur’s wife now. (EVERY episode goes on and on about Arthur’s doubts about being king—Gwen should be going through something similar, shouldn’t she?)

A welcome inicial between Arthur and Gwen in Ep. 2.

A scene where Arthur at least tells Gwen what’s been going on. Any episode. She’s his confidant, isn’t she?

Gwen telling ARTHUR what’s been happening while he’s been away. I know it’s implied that, of course he’s going to be informed, but again, still would’ve been nice to see some acknowledgement/insight into how they work together as king and queen now.

Ep 3: A scene where Arthur tells Gwen about the horn and his father. Again. Wife. Confidant. Hello?

Gwen’s reaction to almost being murdered por HER FATHER-IN-LAW.

Gwen confronting Arthur about still wanting to make his father proud even though his father basically killed her father and then tried to kill her.

A single scene where Arthur and Gwen are alone together.

That’s just this season. So far. Don’t. Get me started on Seasons 2-4. (I think 1 was okay.)

And I ship Merthur! I amor all the Arthur/Merlin scenes in the show. BUT tu can actually have a character be ridiculously close to one character, but still believably have him be in love/sexually attracted to another!

On one hand, I don’t want to lose all these beautiful Merthur scenes, but on the other…come on now. At least include her in their conversations. Something".

Just wanted to post this to mostrar that this isn't just a shipper thing. What these writers are doing por sidelining Arwen is poor storytelling and it isn't just Arwenites who have a problem with this.