I'd assume that when the 777's came out even pilots with experience on the 767 and other Boeing planes were still given ample training beforehand. The minor difference in the Max's model name disguises the seemingly large difference in their operation.
The determination to shoehorn what aerodynamically kind of is a new type of plane into the 737's type rating seems likely to be the root cause of these deaths.
Given that investigation in both accidents is still ongoing and all we know is wild speculation your conclusion is premature even though it finally may turn out to be true.
(Also, I don't agree that we only know "wild speculation" about the Lion Air crash. The investigators have told us much about the proximate cause of the crash, even though their final investigation is not yet complete.)
It's a damning indictment of Boeing, and whichever authorities let them get away with it, that they pushed through an aircraft with a different pilot UI/UX knowing that pilots would then be under trained when using it: like someone said we train baristas better.
I've driven minibuses before and always ensure to get an hour of driving a new model before taking passengers.
That would seem to fall directly on the operator / carrier.
Boeing takes responsibility if the training manuals were not comprehensive. Aviation authorities take responsibility if they under-mandated training. But ultimately neither know a given carrier's scheduling and pilot allocation.
Ultimately Boeing and the airlines share responsibility for ensuring the training is adequate, thats why many airlines have lots of training that goes above and beyond what Boeing supplies.
Not that 90 minutes on a tablet constitutes a reasonable level of training though.
Why would boeings shuffle around such critical human+machine interfaces?
That model name would’ve been worse. The 737-800 is very commonly abbreviated to 738 in the industry (739 being 737-900, 744 being the 747-400, etc).
(Yes, that sorta stuff annoys me ;) e.g. people talking about v2.04 of $project, when they really mean v0.204 - sure, I get it, but at some point the searchability for issues on the internet is going to be screwed!)