Where to get into fallout series?

[Rynjin]

It's easy to ignore the plot of Fallout 4, all you have to do is aggressively ignore the word Shaun.

Sure, right up until you hit the (several) points where you try to do stuff that seems like sidequests but don't become available until after a certain main quest. Like everything involving Nick Valentine (and by extension the entire Far Harbor DLC) for example.

Hell if you use an alternate start mod (which also puts traits back in) you can just never start it, act as if you're just humouring Codsworth, and just play Post Nuclear Loot Goblin the way the game was clearly designed for.

This is not an argument for the game's story structure being good, as presumably the OP will not be using an alternate start mod on his first playthrough. The ONLY mods I recommend for first playthroughs of these games are the unofficial patches.