Enough time has passed to allow the public federation to upgrade their servers to support room version 6. This proposal aims to make v6 the default room version.
The specification adopts v6 as the suggested default room version, making no changes to the stability of any room versions. As of writing, v5 is currently the suggested room version.
Room version 6 has the following specification: https://matrix.org/docs/spec/rooms/v6
Servers will be encouraged to update their config/internal defaults to use v6 instead of v5. This is considered a good problem to have.
None relevant.
None relevant.
None relevant - servers can already choose a different default room version legally. This MSC just formalizes v6 as the default.