It's not compatible with core wallet, but you could still use offline version of iancoleman mnemonic code converter to convert BI39 words to any other supported formats.
Bitcoin core recently added support for hardware wallets so maybe it could still support BIP39 indirectly.

I would not count so much on my memory and brain to remember anything important long term like seed words, with age it gets worse and there is always a chance you get strike by Alzheimer's or something similar disease.
One more flaw is that we are all going to die one day and we don't know when exactly, so you (and your family) are screwed if you don't have backup written on paper or metal.
Don't get me wrong, I think it's interesting that people are creating their own alternative systems for bip39, and you can use whatever you feel comfortable with.