Anyone storing tens or hundreds of BTC using FP should know that there is a serious vulnerability in the chip that is apparently found in an unspecified number of manufactured devices.
If we classified this vulnerability as a serious one, what would we then call it if a chip was vulnerable to remote attacks and if the wallet could be accessed via the internet and tricked into signing transactions without physical confirmation? That's a much more serious case. The problem with the 608A chip model should be a medium vulnerability at best.
608A's predecessor was vulnerable to Single Laser Fault Injections (if I am not mistaken). The upgraded 608A is vulnerable to Double Laser Fault Injections. 608B might also be vulnerable to a more sophisticated manipulation scheme that we don't yet know of but could be out there. It's always a race against the clock and whether or not a vulnerability will be discovered by a bad actor or someone with good intentions.