In my opinion, the advice you gave above to remember or memorize the password, in my opinion is bad advice, the potential for losing the assets held is very large. What you say is very true, if we hold a treasure or property, it would be better if we kept it in a safe place. Like writing it or we can create a phrase using a steel plate or we can create a new email without being contaminated by anything supported by a key like 2fa
According to the OP, his house is not very secured and he's thinking of memorising his recovery phrase well it's a bad idea because the disadvantage is much greater than the benefits, the human brain was created in a way to store information given to it for a very long period, well not everybody has retentive memory and it's normal to forget, if the OP is one with a retentive memory then good for him and the benefit is that no one else can have access to his wallet asides him but the bad side of it is health issues like Amnesia, severe Typhoid or as result of stress and he could lose his assets completely if such occurs and he's not able to remember even if it's a word from his recovery phrase. I support your idea of telling him to strore it in an email supported by 2fa or he could as well get a safe and store the recovery safe written in a document inside it.
Anyone admits that by memorizing the phrase recovery is a bad idea compared to the benefits obtained and I agree with you, of course, every human being has a different memory and from the many activities that we do every day, of course, it is difficult to remember the phrase recovery in the long term and when we can't remember when we want to access the assets we have, of course we can't do anything and can only regret it because of what we do. We have collected it in vain.
Choosing to save the recovery phrase in an email and be supported by 2fa and also write in the form of a document I think is better than memorizing it which we can't necessarily guarantee if something happens of course this is very detrimental.