You're being too vague. It's silly to opine on what btrfs should do without checking whether that's already the case. You should actually point out any specific

You're being too vague. It's silly to opine on what btrfs should do without checking whether that's already the case. You should actually point out any specific default behaviors that are questionable rather than simply speculating ones that may or may not exist. The only specific thing you've mentioned so far is one that you could trivially have found out requires a non-standard mount option.