Hi, have you ever thought this?
You know that, to import a wallet you need the private key or your seed. Taking as example the private key (the 52 letters key). It could exist the possibility someone create a software whose function was to try thousands of times to find the private key till it is be done.This would be like the process to find the new block in mining, anyway you can try the times you want in order to find it.
I think this could be a weakness, correct me if I am wrong.

Or comment if you have a kind of solution for this...
Regards!