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.