now I think it is a bit weird that these 12 words are the keys for everything right they should create more options to change it
I personally don't think it's weird...
You either have to save your wallet.dat (for example, bitcoin core). If you lose your wallet.dat (or your passphrase) you lose your funds.
Or you save your actual private key (for example, older paper wallets). If you lose your private key, you lose your funds.
Or you save a seed phrase (for example, most SPV wallets). If you lose your seed, you lose your funds.
Or you trust somebody else, and you forget the old saying "not your keys, not your coins".
Only the last option doesn't require you to be your own bank, this requires you to trust a thirth party for 100% and goes against the very core of bitcoin... There is no middle ground, being your own bank means you have to make sure you're in controll of your own private keys... So yes, this also means you have to make backups of wallets, make copy's of paper wallet or have to write down your seed phrase...