Now if you have 24 word seed, you do write it in 1 piece of 2 piece or 3 pieces? Example 12 words, its only half the seed.
The issue with this is that you all three pieces to restore your seed. If an attacker steals one, you can't restore the seed from the other two. You could of course leave multiple copies of each piece in different locations, but the more locations you use the more chance of someone finding one.
There are other ways to securely store your seed on paper. For example, you can use methods like
Shamir's Secret Sharing or a modified
one-time pad technique to split your seed in to 3 parts, and require any 2 of them to recover your seed (or 3 out of 5, or any other combination you fancy). Each piece on its own is useless.
But what if you store it in your computer but encrypt it with say axcrypt.
To encrypt it on your computer, it must at some point be on your computer unencrypted. This is not safe. You should only be doing this on a permanently airgapped device.