[nbevans]

I think it is because the changes are, currently, considered esoteric and slightly experimental in the sense they want to reserve the right to make breaking changes to them. SQLite has a relatively slow cadence when it comes to things like this. Other reasons may be that they're still working on the tests to validate and support those features - as well as documentation. I am hopeful BEGIN CONCURRENT and WAL2 will make it into the amalgamation at some future date.

[rogerbinns]

> SQLite has a relatively slow cadence

They intend to support it till 2050 - https://sqlite.org/lts.html - which includes keeping file format and API backwards compatibility. That accounts for the more careful decision making since things added now have to be supported for another 30 years.