[wimdetroyer]

>When your DB or cloud service gives you a printout of your 10 slowest queries, you then have to figure out what object code that relates to

Not if you have proper telemetry set up... Tooling like instana was extremely useful for me to diagnose exactly where SQL statements caused issues

>Extra magic: if you've read a class from the db, pass it around, and then modify a field in that class, will that perform a db update: now? later? never?

For hibernate if you understand the concepts of:

- application level repeatable reads

- it's dirty checking mechanism

- when the session is flushed / entity lifecycle

That 'magic' isn't magic anymore. But every abstraction is leaky (even SQL)