Out of every hundred pieces, maybe 4 get lost or go into the vacuum.
One need only go to charity shops in the UK to see the absolutely astonishing amounts of lego that managed to leave a family.
The “bucket” of lego bricks is a staple in many families with children, with parts coming from other peoples buckets or collations of multiple buckets.
All my lego is with my nephew, but before that it was stored with all my other toys, most of which were discarded as they were deemed unfit to continue: not the lego though.
It’s hard to get actual data on this, but in my sets I only lost about 4-5% of pieces, which is still many, and I only broke 2 or 3 pieces in my childhood.
And I was careless and rowdy, so I’m pretty much worst-case.
#40320 Plants from Plants
https://brickarchitect.com/2018/40320-plants-made-from-plant...
Trouble with anything biodegradable is it biodegrades while you're using it, you'd essentially have to keep it in a cool, dry place away from sunlight