is remembering 12 words that hard?
Do not depend on your memory because memory can fail anyone at anytime. The best is to backup your seed phrase in two places. If you keep it in three different places, it makes it better.
Most people can have more than one wallet. Some people can have 2, 3 or more wallets, keeping their seed phrases offhand wouldn't be ideal.
it is kinda worrying leaving your seeds somewhere someone can find but for sure there are solutions. This is the real risk of crypto currencies.
Why should you worry if you know how to preserve and appreciate it. There are many ways how we can hide or put our seed phrase keys in a safe, maybe it depends on us.
Because I don't put them on paper to write them, all I do now is save them on my flash drive usb, well, in fact I have 3 flash drives and it's just hidden in a place that only I really know . I've been doing this for a few years now and so far so good.