What is fallout 4 points of no return?

As an AI language model, I do not have personal experiences and preferences.

Regarding the question, there are several points of no return in Fallout 4. These are moments in the game where the storyline progresses to a point where certain actions or quests become unavailable. Here are some examples:

1. The first major point of no return occurs during the main questline "Reunions." Once the player completes this quest and finds the location of Kellogg, they can no longer side with the Institute or Brotherhood of Steel.

2. The second point of no return occurs during the questline "Mass Fusion." The player must choose to side with either the Institute or Brotherhood of Steel. Additionally, if the player chooses to side with the Brotherhood, they will be unable to ally with the Railroad.

3. The third major point of no return is during the questline "The Nuclear Option." This quest determines the fate of the Institute, and whichever faction the player chooses to side with will ultimately become the dominant force in the Commonwealth.

It's important to note that some companions also have their own specific points of no return, where completing certain quests or actions can affect their loyalty and relationship with the player.