Because currently, I can say from 100% experience that - a novice listening to some of the "security strategy" advice given on this board is about in as much financial peril as a person who refuses to sell his stocks at the clear beginning of a market crash because his broker told him its all good, and part of a "cost averaging strategy".
I created paper wallets as relative newbie. You can bet your arse I tested them inside out with multiple dust sweeps before committing any real funds to one. Once that was done I backed them up about ten times over.
It didn't take any research to realise that the potential to send it all up in smoke was there. As with everything else in this space, you have to make your own conclusions rather than blindly following others. There's good info to be found out there but ultimately it has to be your call.
That's not how the majority operate but there are more hand holding options than ever before. The ease with which your money can disappear is very unfortunate but this is still a rather raw technology and it shouldn't be passed off as anything else right now.
I am about to start messing with some physical coin wallets (paper wallets but qr on coin with seal) and I am already playing with the tech before I start adding funds and about to practice with some seals and paper types for the QR code (making custom coins and using custom seals). I am thankful for this thread to remind me to slow down when handling money and especially on these offline paper wallet generators.
There could definitely be an option for it to hold the private keys until you close the offline page and a warning that it will delete them when it is closed (with multiple confirmation boxes and a type YES box), when you're offline I don't see how this could be a security issue. There could be a warning to this when you open the program that you need to close it all the way out to secure everything.