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!
The concept of btc itself is secure and is definitely impossible to steal if certain measures such as buying and storing in a hardware wallet are takjen. Encryption makes it nearly impossible to crack as the number of attempts to crack it would take a lot of time.