IBM POWER (Performance Optimized With Enhanced RISC) was designed and built by BRILLIANT people when it came out in 1990 as the RT/PC (horrible product) but then quickly recovered with RS/6000 in 1990. Those great IBM people like most others are LONG GONE.
Through many years IBM has F'd up all facets of the POWER line as it became to be known as they kind of merged AS/400 and RS/6000 in "Power". Whoever renamed OS/400 OS to IBM i (despise the lower case i) should have worked at Ringling Brothers Circus. And of course customers were confused on the horrible merger of AS/400 and RS/6000 into Power even today.
So today, somewhat surprisingly I would estimate 70+ of IBM Power sales are to IBM i customers (no net new customers all refresh) and 20% or less to Power AIX customers. While you can run LPARs on Power systems to run IBM i, AIX and Linux on Power servers VERY FEW do it.
At launch AS/400 and RS/6000 had quite good software ecosystem support. But now it is on hospice care.
I sold Power systems for 4 years recently after many years in x86 and was struck how far removed IBM people are from customer projects and relationships. Many new IBM "sales people" 6 months ago were selling cosmetics at Ulta or working at the Verizon phone store.
All things IBM Power like all things at IBM are run by incompetent people who were promoted based on s-x, race, gender, skin color etc.
Power actually has 2 of the Top 10 Top500 supercomputers with Summit and Sierra about 8 years ago but of course some genius at IBM decided it cost too much to work with Nvidia anymore to support Nvidia GPUs after Power9 so P10 and P11 have no GPU support and that was that and now IBM is a nothing burger with Power for AI and HPC.
The latest "big push" by IBM for Power is PVS PowerVS Power Virtual Server which is essentially IBM no longer wanting to sell on premises systems as that is a spike of sales every 5-6 years but running IBM Power systems in 10 IBM data cts around the world in a cloud/SaaS like manner for Arvinds cash flow executive pay addiction. Of course it is buggy, expensive, horribly supported etc.
I think Power will be sold to a Dell or Lenovo or Oracle or Indian company or flame out like Intel Itanium and HP PA-RISC etc etc.
IBM's pipe dream for hardware is very muddled. Quantum "is coming fast" we have heard for 10 years. IBM thinks mainframes will actually grow and is addicted to the z mainframe revenue stream as Nokia was before iPhones. Power just sits in the corner.