Portal xp farms my opinion.
I'll just say it right away...
I don't like it.
The challenges in the game exist for a reason. And playing these XP farm servers takes away the whole idea of grinding.
I agree with most players that the challenges need an update or re-work
And from this point of view, I could understand wanting to complete some challenges on these servers, but of course, many players don't stop there and max out their guns or class completely.
Playing these XP farm servers will blow up your stats to a point that's way above your actual skill. When you start playing normal EA servers again, you will get destroyed by other players who are way above your actual stats.
In BF 2042, we all just abused the game in the last Battle Pass because of the rewards for BF6. This shouldn't become a thing in BF6 right away.
In my opinion, Portal should be limited in XP. It's not the core gameplay of Battlefield.