Here are the reasons why I personally think Managarmrs should be removed from Ark Survival Evolved.: 

PVP aspect: Before the release of the Extinction DLC for Ark, PVP used to be really fun! You actually were able to use tames like Wyverns, and griffins, (or really anything without a saddle) to fight people. Now you can't even use half the tames in this game to fight people, because Managarmrs counter everything. If you're fighting a Managarmr, you have to use a tame with a really good saddle. Even if you have a really good saddle, all they have to do to avoid your attacks is jump, dash, etc. It's very difficult to fight someone on a Managarmr, unless you have a Managarmr with either the same, or better saddle the the enemy. 

Xbox/PlayStation: If you're using this tame on either Xbox, or PlayStation, you'll most likely lag every 5-10 seconds, and have a good chance of crashing. I'd say just avoid using it and just use another tame to get around the map, but you're then more likely to die to someone on a Managarmr. 

People who use Managarmrs: I've talked with many different people, from people just starting out, to people being the alpha of the server, and they've all said the same thing. Managarmrs are to overpowered, and honestly shouldn't even be in this game. I've talked with people who have the best saddle, and top stat version of Managarmrs, and they don't even like the tame. They just use it to fight people on Managarmrs. Obviously, I can't say nobody likes this tame, because there's gotta be some people who enjoy this tame, but I can confidently say that most people don't like Managarmrs and only use it to counter those on Managarmrs. 

Dying game: I think most of us can agree that Managarmrs have destroyed this game, and made PVP unbearable. I know people who have quit playing just because of these tames alone. Ark Survival Evolve is a dying game. I love this game so much, and don't want to see it die. I really do believe that getting rid of these tames with help it stop dying, and maybe even get some more people to play this game. 

I really hope me typing this out gets people to agree with me. I know this is a big change into the game, and I should've created this a long time ago, but late is better than never. Thank you all for reading this!