Pretty telling in that SaffonOlive article that the only color that hasn't had a banned card yet is Red.
RED UNDERPOWERED FOREVER
In Standard? Yeah, red's never been banned in Standard, but the Modern Banlist has plenty of red cards iirc.
Every single planeswalker not in the gatewatch > Gatewatch PWs
The need to embody 1 color and only 1 color just makes all of them feel really 2 dimensional and predictable.
Edit: Knew I'd find a caveat if I thought hard enough about it- Liliana is more interesting than Bobby Nixon, if only because they had to find a way to take a previously malovolent PW and give her enough character to make her a part of the power rangers while Ob just goes full ham as a Saturday morning cartoon villain.
Generally I can agree, if only because any sense of actual character(Gideon's underlying guilt from his hubris killing everyone he loved, Jace forgetting literally everything that made him somewhat interesting in his origins story) has been completely removed. We never see Gideon actively feeling guilt recently for those he can't save. Like, The need to force them as mono coloured(despite a very, very strong argument for them being dual colored) is frustrating from a character design point, because why the hell is the living Guildpact MonoBlue when White is the colour that most directly embodies a governing law?
Also, Bobby Nixillis is great because he's literally a Saturday Morning Cartoon Villain. Considering the Gatewatch(minus Liliana) is fundamentally a bunch of 1 dimensional characters. He also wasn't that bad until Nissa pissed him off, because Fuck Nissa and her Grodd Damned "I'm precious and Zendikar loves me" bullshit.
Sure, if by "Nahiri did nothing wrong " you mean "Willingly left Zendikar to get fucked by Ulamog(Despite the fact that said world was able to trap Ulamog even without her help) while completely fucking over Innistrad by killing the balance system Sorin Built( Shitty as it is, it at least allowed for the ecosystem to be stable for 1000ish years), bringing in Emrakul to nuke the plane, with no clear way to trap/remove Emrakul because she's mad at her ex." If Nahiri had her original plan unfold, Emrakul would have killed all of Innistrad and still be running around the Multiverse, with the potential bonus of another Titan being formed* and they're back to square one
*there's a theory that Brisela was Emrakul trying to make a new Titan based on the art.