Creating Ethereum, Bitcoin and other accounts is complex and fraught with potential for loss of funds.

A 12- or 24-word BIP-39 seed recovery Mmnemonic Phrase helps, but a single lapse in security dooms the account (and all derived accounts, in fact). If someone finds your recovery phrase (or you lose it), the accounts derived from that seed are gone.

The SLIP-39 standard allows you to split the seed between 1, 2, or more groups of several mnemonic recovery phrases. This is better, but creating such accounts is difficult; presently, only the Trezor supports these directly, and they can only be created "manually". Writing down 5 or more sets of 20 words is difficult, error-prone and time consuming.