->Writing and keeping it with you/your place: What if someone got the access in your absence of theft or any disaster?
That's a good question, actually this have been discussed due to the recent events of floods, earth quakes etc. Best practise is to avoid stealing of seed phrase is to encrypt your seed phrase and then keep it anywhere, because a single non technical dude can not decrypt that seed phrase and you will be saved.
From disaster, you have to keep the seed phrase in another place like far from your own phrase. Maybe store the seed phrase in another region, city or where you think the disaster will not make any impact and you can access it easily.
-> Obviously keep it online in email of any other way is risking your funds.
Many users prefer to keep them online because that's the longest way to preserve them and if you have selected a drive or I line cloud storage that have distributed storage devices and have auto saving or cloning options then that better then storing on paper. But many will not agree with me.