AddRange advice is BS

[DickBaker]

p65 of the pbook states ".. make sure you're leveraging batching (e.g. calling the AddRange() on your DbSet collections ..EF Core will then create a TVP and MERGE.." which IMHO is rubbish. Invoking AddRange rather than multiple Add calls probably more efficient, but surely has no consequence for batching which is achieved [much] later at SaveChanges time when the ChangeTracker discovers changes (via DetectChanges) and then sends the ordered & optimised TSQL to back-end db.

Batching is discussed here
https://docs.microsoft.com/en-us/ef/core/performance/efficient-updating