max reorg depth in NXT is 720 blocks
Checkpoints are centralization.
Mex reorg depth isn't checkpoints.
It is if you expect it to be honored objectively by offline nodes (propagation isn't objective proof because it can be Sybil attacked). I will let monsterer explain that to you, if you don't understand.
May be you will explain us what exactly is centralised in a cryptocurrency (doesn't matter PoS or PoW) whose nodes reject reorgs if they are deeper than the max allowed depth?
Maybe first you can explain why you are too ignorant to understand what I wrote which thus makes your reply irrelevant noise.
I like to quote such sentences for posterity.
Now on the matter. If your node discovers a fork that is longer that the max reorg depth you can interpret that like if the node rejects to resolve the conflict in automatic manner, it prefers to stay on the fork it was before the conflict was discovered and lets you resolve it manually.
And you can be sure, in the case of such a major attack there will be a lot of forum threads, news, buzz, and it won't be difficult to detect which fork is a legit one.