In my opinion the only way to be secure from seizure of your funds is to memorize the seed. With 12 words it's much easier. This is why I need to generate the 12 words.
Thats a horrible idea.
Even if you are going to memorize the 12 words, without a proper backup this is just careless.
There are a lot of things which can happen which lead to a loss of your memory (e.g. car accident, alzheimer, trauma, shock moment, ...).
Your whole cryptos would be gone in this case. A proper backup (better: 2 or 3) is a must have.
I have to agree a lot of people have forgotten their seeds in that way, to keep you some real life example a lot of people are even forgetting their 6 digit ATM card pin numbers already what more if you will memorize 12 words or even 24 words. Writing it down is really the way to go. And if you really don't trust that process you can scramble their arrangement and have another note written where you will write their proper arrangements, both notes must be hidden in different location, preferably on a safe and secure location/place only you will know.