A company can’t stay viable based on “marketshars”. Next am I arguing what’s “best”. Do you think Dell would rather be in Apple’s position with “market share” or Apple’s in Dell’s?
There are plenty of people whose only personal computing device is their phone either by choice or necessity. Heck I am a developer and the only thing I use my computer at home for is as a Plex server.
It’s on my list to get a powerful enough NAS to transcode movies and I won’t even use it for that. I’ll run Plex and bit torrent (to uhh download Linux ISO’s) and B2 backed cloud backup app directly on it.
My wife gave her computer to our son because she uses her iPad for everything including Office.
Now that Apple (finally) supports a mouse, I connect my same Bluetooth keyboard+mouse to my iPad that I use for my work computer when I bring it home.
The people you know. Not everyone can afford to buy a desktop computer, and for many of these people a phone is their primary computing device.