"where possible" is a keyword here and easy to argue about. For example:
* my logic requires a database
* my logic should be isolated for compliance reasons
* my logic accesses a service which is not available for everyone
* my logic should be processed async and needs to store state, how do I make sure library owners have that environment
* customers embedding my library are not upgrading it frequently, which leaves us to support 15 years of libraries
* ...
