I see
In this Alpha build, we’ve removed the rested area requirement for changing Talents and Loadouts. Players are now be able to change their talents anywhere out in the world, as long as they’re not in combat. Additionally, previous restrictions such as not being in an Active Mythic+ instance or in a Rated PVP match still apply. In tandem with loosening this requirement, we’re adding a 5 second cast time when players change their existing talents/loadouts to prevent players from immediately swapping between different builds.
https://us.forums.blizzard.com/en/wow/t/dragonflight-alpha-development-notes/1278546/7
I don’t like it, I’ll request having tomes/being in a rest area as an option to respec without cast times. I’d rather pay every single time than respec once with a 5s cast