[HomeDeLaPot]

Of course you have to care about architecture. ARM has been in the making for a long time now, and I can only imagine how far behind z is in terms of software support. To succeed, IBM would have to get Linux, Postgres/MySQL, Nginx/Apache, Java/Python/NodeJS, and the rest of the whole modern x86 ecosystem to work on z—that project would never be done. Or they could build their own, different tools—but they kind of already have, and why would anyone switch to those? To catch up with the other cloud providers, IBM needs to start with what everyone's already using—x86—and use their capital to build an advantage from there.