(as ranochigo said) if you want more security with Ballet wallets - use the pro version - then there is no real trust needed as the key is protected thru BIP38 - the whole point with the Real series is the ease of use and for introductions for those unfamiliar with most things related to crypto.
I use a pro series card and carry it with me - with no concern if it got lost as the private key is useless without the pass phrase which only I know and I keep a back up in the safe.
Still, that being said, most of my funds are stored on core wallets that are stored on an encrypted portable drive that requires 2 usb keys to unlock and there is only one key with the drive at any time unless I am using it.
I do promote them for use for those just starting with crypto - I trust that Bobby will not be stealing the funds - his employees? meh... I never recommend any vast quantity to be stored on them, though there is over 30 million currently stored on ballet cards. And there has never been a complaint that anyone's funds have disappeared. Bobby is also the only person to have ran and closed an exchange where everyone got their funds.
I personally collect them (without using them) as collectibles
and raspberry pi's are still sexy af
here is my twin pi (two raspberry pi 4's 8gb versions with a 250 gb drive on one and a 500 gb drive on the other.