Because a security vulnerability in the common library will have a much larger impact. It also increases the potential attack surface by adding more components. Companies value the secrets they keep and want to make sure they have 100% vertical control, where they can audit everything.
Also, at any project with a sane architecture, you're using 1 vault and maybe 1-2 ambient strategies to pass the data. You won't use all the vaults at the same time anyway
Also, at any project with a sane architecture, you're using 1 vault and maybe 1-2 ambient strategies to pass the data. You won't use all the vaults at the same time anyway