@Thehumaneldar
The reasons I say that ME Andromeda should be non canon stretch beyond just the fact that "it was a failure".
It makes absolutely no sense.
In order to travel between nebula clusters in Mass Effect, you require a Mass Relay to warp you between relay points, turning what would be a trip of a few decades (or millennia in the case of a trip across the galaxy to the opposite end) into a few hours.
Humanity had just entered the galactic community within less then three decades. We discovered that the galaxy was not lonely but home to literally dozens of alien lifeforms and many habitable planets to make colonies on.
Even though we had jumped forward heavily thanks to the knowledge gleaned from the Prothean Archive on Mars, we were barely on par with the other species in the galaxy in terms of technology.
The Andromeda Initiative makes absolutely no sense given the context of the Mass Effect universe lore because ---
A human proposed the project and the galaxy views Humanity as greedy and ignoble newcomers who have yet to gain the trust of the people.
The project to build the Nexus and the Arks would be astronomical money dumps that investors would shy away from due to the fact that there are no returns to be made from such an endeavor.
The Andromeda Initiative's pitch of "Too many people, not enough worlds" is ludicrous since every species has gathered a wide berth of colonies, and Humanity was still discovering new worlds to make colonies on.
Without the use of a Mass Relay, the Nexus and Arks SOMEHOW made it to the Andromeda galaxy within a thousand years; which makes no sense seeing as Andromeda is 2.537 MILLION Light Years away from our own galaxy.
Andromeda requires us to ignore the galactic politics and the technological limits established in the main trilogy of games in order to allow MEA to be a game.
Honestly, it feels like someone at BioWare had pitched Andromeda at a meeting, and then someone said it had to be a Mass Effect game in order to boost sales off of brand recognition.
To put Andromeda on a smaller scale, imagine growing up and finally moving away from your parent's house. But instead of choosing a rental close and in your city, or just moving to a new city nearby to attend university and pay rent; you instead chose to take an overly expensive journey by car and boat across the planet to the opposite end in order to rent out an apartment.
Just for the sake of "New Frontiers".
In this scenario it is just one financially incompetent guy.
The Andromeda Initiative is literally just shy of 6,000 people making the decision to to galaxy hop rather than go to a safe colony world.