I disagree with the above statements. Ridden monsters used to be trash in earlier editions, especially the unarmoured ones like griffons and manticores. Going back to that system will just mean they get shelved again. And I fail to see how removing options (equipment) would somehow give us more options...
Wut? Ridden Monsters were great from 4th thru 7th edition.
8th edition was literal hot garbage and killed the game.
Removing the superior defensive combos on large targets present more options because players no longer have a clear "best" options. When a game gives you multiple options and one option is best in every circumstance - the game isn't giving you options - it's being a literal piece of dogshit.
I can't speak for 4th-5th, but in 6th-7th most of them where terrible (and 8th was terrible in general, on that we can agree.)
Unarmoured T5 monsters died to anything with more punch than a bow, and Cannons bounced on both rider and(!) monster, usually killing either of them in the process.
The problems in TOW isn't monsters having a save, be it ward or regen - it's monsters having tripple layers of saves and possibly other shennanigans on top. A Griffon, Hippogriph, Manticore or Carnosaur with a 3+ or even a 3+/5++ isn't the problem. The problem is stuff like HE and Chaos Dragons with 2+/5++/5+++ or 3+/4++/5+++, etc. Better monsters with better saves on top just pushes it too far.
By making Bedazzling Helmet (And Blood Armour for Dark Elves) infantry/cavalry only, GW are taking steps in the right direction. Now they only need to tweak all the other (often cheap) +1 save items in the game and soon ridden monsters with a 2+ in combination with ward and/or regen will be a thing of the past.
Honestly, the Bedazzling-change alone is already making me less interested in the Griffon General and more willing to run a Demigryph Grand Master instead, but I'm absolutely not writing off the Griffon General. He's still good, he's just not "as good" = more options.
If he (Griffon General) couldn't take any magical items however... yeah he'd be on the shelf in an instant = less options.
Edit: The FAQ also nerfs Tomb Kings on Skeletal Dragons. Per the FAQ; you only get the magical effets of an armour if you actually use it, so if you want the benefit of Armour of the Ages (the number 1 go-to armour for Kings on Skeletal Dragons) you're gonna have to make do with that 6+ light armour instead of benefiting from the Dragons 4+.
So slowly but surely, Ridden Monsters are getting tweaked. Shame they forgot(?) to tweak that stupidly underpriced Dragon Helm for HE and those spammable trollpants for OnG. Maybe in the next update...