You're correct on the seed phrases getting exposed to the internet later but it's dependent on the kind of camera with which is being used to capture the seed phrases because not all camera gives the phone access to store files deleted on cloud and if it doesn't involve a camera that stores trashes for some interval of time before it gets exposed to cloud how will it be exposed and besides not all phones automatically stores photos on cloud.
That could be phones but normally all the phones this days actually are a risk apart from the cloud there are other apps that collects informations like this but you can’t be too sure, once a phone has actually been connected before to the internet then it is at risk. This is part of the reason why wallets blocks taking screenshots of seed phrase. The best thing still remains retyping it just like electrum does.
I've done more important things, even passwords by rephrasing them for so many years now and believe me my brain captures exactly how I manipulated everything and I've never gotten any mixed up in the course of me rephrasing some important things that I don't want anyone to understand except me though your advice is welcomed. I know the reason why you assume it to be a bad culture because of if it involves a long time that I might forget how I rearranged everything but trust me I'm very good at remembering how I manipulated anything that's of importance to me even in the long run.
Ever heard of an accident that causes Amnesia? Accidents are unpredictable just like death, so no matter how sound you think your brain is it is bad to actually depend totally on it. Don’t be too confident on your remembering ability. Backup your seed offline in the correct order and add a passphrase.