anonym:
In Tails' threat model it is assumed that adversaries monitor the default bridges provided by the Tor Browser, and that our users want to avoid detection of that, so we are not interested in adding the default bridges to Tails
We're not offering the default bridges in Tails also because it's impossible right now to store your bridge configuration in the Persistent Storage.
We're afraid that this would lead to more people relying on the default bridges in Tails than in Tor Browser, where you can configure your custom bridges once and for all.
It's also currently easier to get custom bridges from Tor Browser outside of Tails than inside Tails.