All in all, this is an unfortunate turn of events for everyone involved: I can't imagine how awful it must be to have worked for 3-5 years on this project and probably crunched to get the product out in time even though it still ended up in a very unpolished state. At the same time, it is terrible for Mass Effect fans and potential newcomers to be excluded from an unfinished and unrealized creative experience, especially after five long years of dormancy, silence and lack of transparency. And finally, it is bad for EA in the sense that they invested a lot of money into this project and had faith in Montreal/Edmonton/Austin reaching the finish line in a proper manner after five patient years. And in total the Mass Effect brand will be somewhat damaged with any potential sequel (if EA doesn't shelve it) having an uphill battle of regaining lost trust and faith in the brand and product.
Clearly no one wanted this and it is simply an unfortunate result of things we can only speculate about - project mismanagement, complexity of new tools, development of new pipelines, scrapped ideas and concepts without backup plans, etc. We know that several people left around end of 2015/beginning of 2016, so perhaps that was back when the game got retooled into something else. Regardless, it would be interesting to read a transparent post-mortem.
I hope for the best in terms of post-launch support and given what I've heard, there'll be some blog post next week or so. But I wonder how much can be saved at this point.