Build quality and simplicity of design are two major features of the Moccamaster.
I don't doubt the Breville is solid but it sounds like a lot of electronics going on...long term reliability would be a possible concern.
People swear by the bloom feature on machines. I have it and used it on the Motif Essentials that's my backup...bot I can't taste the difference when I manually perform it with the Moccamaster.
I imagine it's all about individual taste and expectations.
If I don't perform that on the MM, the coffee while "good" is just not fully "developed". IDK another way to describe it. My suspicion is though, if you're lucky enough that for whatever reason you have a MM that fully wets the grounds count yourself among the fortunate ones. I just have too many things distracting me in the AM to "deal" with babysitting a coffee maker. I have blood sugar readings, blood pressure readings and weight to record, meds and one or 2 injections to take all while an impatient wife wants her caffeine fix
So, it means an AWFUL lot to me to be able to grind, dump, and go while I take care of the myriad other things to do.
As for reliability in the case of my MM and of my Breville both are machines I could not justify (at least for a trial run) to buy as brand new. I managed to find both from estate sales while the OXO I purchased brand new (from Amazon IIRC but again not absolutely sure). So I was able to buy both inexpensively enough that if they became my long term solution to my needs I would not feel badly dropping the $300+ and going "all in"
And FWIW the Breville I found is apparently from 2018 and still functions as brand new and looks nearly as good. Everything is still tight fitting, and clicks together perfectly. The PID electronics function perfectly as well. So I have no doubt it would be a good long term investment should I decide to go that route. As well as a Moccamaster for that matter.
But, again there, I see so many people online who get the same result as me, that I know investing in another one brand new would not solve the issue.
Who knows why I have the issue. I have tried everything I can think of or people have told me (descale it, try different beans, try different grind levels, try different water, etc, etc) The only way I have found to have it wet evenly is to grind down to espresso level grind. Which creates another issue (a mess), and muddy coffee.
So far while not a perfect cup........................yet, the Breville seems to be able to offer me the flexibility to reliably make the cup I want.
But also understand in speaking of "build quality" I am taking more into account than just whether or not I see it as like a vault. I am looking at how "polished" it is. And with all it's ancillary pieces and bits I personally just find the MM a little Rube Goldbergish in a way. I'm not meaning it as cheaply made just too many little "bits and pieces". But I have no doubts about it's "quality" or longevity.